Version info in lock file and export log

[vearutop]

This pull request aims to improve deps info redability in export log by adding commit info (including tag name if available)

[INFO]  Exporting resolved dependencies...
[INFO]  --> Exporting github.com/Masterminds/vcs v1.12.0@6f1c6d1 (^1.12.0) 2017-09-11 Matt Farina <[email protected]>
[INFO]  --> Exporting github.com/codegangsta/cli v1.20.0@cfb3883 (^1.16.0) 2017-08-11 Jesse Szwedko <[email protected]>
[INFO]  --> Exporting github.com/Masterminds/semver v1.3.1@517734c (^1.3.0) 2017-07-10 Matt Farina <[email protected]>

Also in glide.lock file by adding brief commit info as yaml comment

hash: 9678e016890de949db9cfcae386b5ae1a4c2149ccd602aad33ac90d7c19d117e
updated: 2017-09-22T16:50:29.351652493+07:00
imports:
- name: github.com/codegangsta/cli
  version: cfb38830724cc34fedffe9a2a29fb54fa9169cd1 # v1.20.0, 2017-08-11
- name: github.com/Masterminds/semver
  version: 517734cc7d6470c0d07130e40fd40bdeb9bcd3fd # v1.3.1, 2017-07-10
- name: github.com/Masterminds/vcs
  version: 6f1c6d150500e452704e9863f68c2559f58616bf # v1.12.0, 2017-09-11
- name: github.com/mitchellh/go-homedir

[mattfarina]

@vearutop Interesting idea. I had not thought of this but I kind of like it.

/cc @sdboyer your thoughts? I'm thinking if something like this would be interesting to dep. I would want a feature to land there before I add something to glide so the feature has a future.

[theo-schaeffer]

Very interesting idea, it would help us to easily compare deps versions in our different projects.