Added default .gitignore
Added support for roll auto-versioning
Merge pull request #2 in APS/sdsc-roll from feature/APS-46-add-version-sh-to-sdsc-roll to master

* commit 'e56f1613616ce92ba604357c1b9d4b2e1396031c':
  Added support for roll auto-versioning
  Added default .gitignore