Update submodule vim/bundle/session 7938a27...4664cc7

* vim/bundle/session 7938a27...4664cc7 (152):
  > Bug fix: Don't persist &go and &gfn when !has('gui') (issue #54)
  > Merge pull request #51
  > Pull request #45: Don't ask to forget when not recalling last session
  > Merge pull request #45
  > Improve integration between vim-shell & vim-session (issue xolox/vim-shell#11)
  > Persist Vim's verbosity (makes it easier to debug :RestartVim :-)
  > Bug fix for :RestartVim on Windows (fixed quoting)
  > Document vim-misc as external dependency
  > Merge branch 'master' into dev
  > Merge bug fix for auto-loading of tab scoped sessions
  > Cleaned up old miscellaneous scripts
  > Remove compatibility checking of miscellaneous scripts
  > Updated miscellaneous scripts
  > Updated miscellaneous scripts
  > Bug fix for automatic, periodic session saving (issue #26)
  > Updated miscellaneous scripts
  > Support for Conque Shell (issue #17)
  > Define menu items for commands defined by plug-in (issue #41)
  > Merge pull request #35: Create session for current tab page only
  > Option to automatically save sessions every few minutes (issue #26)
  > Bug fix: Make auto-load work when 'viminfo' contains '%' (#19)
  > Make it easier to save a session for the 1st time (issues #19, #25)
  > Bug fix: E121: Undefined variable: a:var (issue #39)
  > Make it possible to forget the last used session (pull request #33)
  > Enable non-verbose interactive prompts (pull request #33)
  > Make :RestartVim work on Mac OS X (issue #36)
  > Option to set session filename extension (issue #22)
  > Option to set default session name (issue #22)
  > Expand environment variables in command arguments (issue #20)
  > Bug fix: Release session lock before launching new instance (:RestartVim)
  > Updated miscellaneous scripts
  > Updated miscellaneous scripts
  > Merge pull request #30
  > Invoke autoload functions instead of custom commands
  > Make compatibility with miscellaneous scripts explicit
  > Merge pull request #32
  > Skip "save changes?" prompt when reopening sessions
  > On session restore, maintain cwd after loading NERDTree
  > Don't fire SessionLoadPost event until session is fully loaded
  > Remove dirty session tracking (it's too fragile)
  > Bug fix: Disable :argglobal/:argument commands just like :args
  > Add .gitignore file and ignore doc/tags (closes issue #15)
  > Bug fix: Strip :args from :mksession output
  > Support for BufExplorer windows (issue #12)
  < Version 1.4.25
  > New g:session_command_aliases option (issue #11)
  < Version 1.4.24
  < Version 1.4.23
  > Updated miscellaneous scripts
  > Merge branch 'master' of https://github.com/xolox/vim-misc
  > Work around &shellslash setting on Windows
  > Merge branch 'master' of https://github.com/xolox/vim-misc
  < Version 1.4.22
  > Documentation bug fix for previous commit
  < Version 1.4.21
  > New 'session_persist_globals' option (requested by Roman Byshko)
  < Version 1.4.20
  > Make :RestartVim preserve $VIM and $VIMRUNTIME (issue #9)
  > Mark session dirty when buffer list changes? (issue #8)
  < Version 1.4.18
  > Updated miscellaneous scripts
  > Merge branch 'master' of https://github.com/xolox/vim-misc
  < Version 1.4.17
  > Silence "E95: Buffer with this name already exist" messages (issue #7)
  < Version 1.4.16
  < Version 1.4.14
  < Version 1.4.13
  > Separate persistence of &background vs. :colorscheme
  > Improve support for special windows, specifically NERDTree
  > Support for mirrored NERDTree windows (issue #7)
  > Switch order of :colorscheme, :set background= commands (issue #6)
  < Version 1.4.12
  > Updated miscellaneous scripts
  > Merge branch 'master' of https://github.com/xolox/vim-misc
  < Version 1.4.11
  < Version 1.4.10
  > Version bump because of miscellaneous scripts
  > Merge branch 'master' of https://github.com/xolox/vim-misc
  > Move version variable to autoload script
  > Merge branch 'master' of https://github.com/xolox/vim-misc
  < Version 1.4.9
  < Version 1.4.8
  < Version 1.4.7
  > Define version as variable, include version in messages
  > Bug fix: Don't hang during :RestartVim when &verbose >= 1
  > Ignore "No fold found" errors
  < Version 1.4.6
  > Ignore missing fonts (reported by SteP)
  < Version 1.4.5
  < Version 1.4.4
  < Version 1.4.3
  < Version 1.4
  > Make it possible to disable automatic loading/saving (suggested by Tommi Kivelä)
  > Restore NERDTree buffer after :CloseSession
  > Remember the 'background' setting
  > Enable opening last used session when starting Vim (thanks to James Cox for suggestion)
  > Remove hack that checks whether submodule is initialized
  > Remove reference to submodule from installation instructions
  > Merge vim-misc repository as subdirectory
  > Delete submodule
  > Make :CloseSession close buffers (or they'll keep piling up)
  > Make :OpenSession and :CloseSession preserve working directory
  > Change download links to include .zip extension
  > Change repository layout to be Pathogen friendly
  > Cleanup to-do list
  > Fix propagated typo.
  < Version 1.3.8
  > Simplify save_special_windows()
  > Instrument :OpenSession / :SaveSession with xolox#timer calls
  > Try to restore quick-fix windows...
  > Add links, Pathogen hints to INSTALL.md
  < Version 1.3.5
  < Version 1.3.2
  > Remove duplicate code and fnameescape() bug
  > Move Windows checks to autoload function
  > Persist window size for plug-in windows
  > Restore compatibility with netrw buffers
  > Move some duplicate code to a function
  > Improved & documented the :RestartVim command
  > Use real script name in messages
  < Version 1.3
  < Version 1.2.3
  < Version 1.2.2
  < Version 1.2.1
  < Version 1.2
  < Version 1.1.1
  < Version 1.1: Initial upload
  > Added INSTALL instructions for GitHub users
  > Added caveat about quickfix/location lists to README
  > Remove modeline from README.md
  > TODO Persist quickfix/location list windows
  > Use :mksession instead of reimplementing it!
  > Silence :RestartVim and ignore lock files
  > Make Vim on GTK restore &lines and &columns
  > Improve command argument handling
  > :ViewSession to quickly view generated Vim scripts
  > Qualify syntax_on, did_load_filetypes, etc. with `g:' prefix
  > Bug fix? Unlock deleted sessions
  > Redraw tabline after restoring sessions
  > Vim 7.0 compatibility, :Restart improvement
  > Improve compatibility with :mksession by setting g:SessionLoad
  > Experimental support for buffer list persistence
  > Experimental :RestartVim command (to be documented)
  > Enable user defined SwapExists autocmd using <nested> keyword
  > README updates, session locking in :SaveSession, version bump
  > Updated README
  > Version bump, miscellaneous changes.
  > Basic support for restoring NERD tree
  > Added uniform confirmational messages to :commands
  > Removed redundant commands
  > Improved README, added automatic update support
  > Initial commit