Removed 'version' from .gitignore file.
Added 'version' file.
Reverting version file to test new version script.

Details:
- Changed version file contents to 0.1.2 so that I can test out a new
  version file bumping script.
Version file update (0.1.3)
CHANGELOG update (0.1.3)
Added bump-version.sh script to 'build' directory.

Details:
- Added a bash script, bump-version.sh, to aid in incrementing the BLIS
  version string.