Multiprocessing and modern GPU

• fixed multiprocessing codes
• it can now be run on modern GPUs
• revised installation instruction
• one installation instruction for all kind of GPUs, backward compatibility
• also runs on CPUs seemlessly

Equipped with testing

• added tests based on one of Chris Rorden's data
• allow varying num epochs training and use the last epoch weights automatically
• download IIT mean b0 template from their server

First master branch

Merge pull request #7 from pnlbwh/remove-ext-dep

Remove external dependencies

Publish model

• Publish models with GitHub release
• External dependencies i.e. pnlNipype, FSL, mrtrix removed
• Enhanced documentation

Obtain Zenodo DOI

Initial release for obtaining DOI