change sbt version (0.13.0)
Fix issue #43

Fix issue #43 : https://github.com/sbt/sbt-native-packager/issues/43
After fixing issue #43 fix issue with ComponentFile that was using a wrong DirectoryRef ID

Make sure we only have one '/' for each separator and no '/' at the end.
Merge remote-tracking branch 'origin/master' into wip-jsuereth-fix-43
Remaining fixes for #43 - Play + Windows packaging.

* Use windows path locations when creating shortcut objects.
* Ensure menu names for shortcut objects don't have invalid characters.
Merge pull request #50 from sbt/wip-jsuereth-fix-43

Fixes #43 - unable to create MSI of play application