Add setting to control version bump
Added sbt-cross-building plugin for building with sbt 0.11.3/0.12/0.13
Returned back build.properties file (and changed version to 0.12.4)
Merge pull request #50 from ohnosequences/feature/cross-building

sbt-cross-building for 0.11.3/0.12/0.13
Merge remote-tracking branch 'origin/pr/46'
Consistent setting prefix. Use Bump.Next as default.
Add documentation for Version.Bump.
Show the correct version format string in the error message.

Fixes #48.
Update release notes.
Set version to 0.8
Merge pull request #1 from sbt/master

Update master