Merge pull request #10 from naamannewbold/master

Only remove ivy cache for play projects
Fix refernce to bin/compile with $BIN_DIR var. Fixes issues #11.
Universal SBT launcher.
Cleanup unused code and md5 checks
Clean up detect logic and failing tests.
Escape dot in sbt.version
Unit tests for version selection.
Fix compile error on Ubuntu
Use a context dir for sbt version detection.
Use expr instead of bash-specific regex.
Strip out whitespace chars with sed and use expr to match the version.
Merge pull request #14 from heroku/new-launcher

Support SBT 0.11.3 With the Universal Launcher
up to xmx1024
Move play ivy cache drop after cache repacking
Differentiate Play 2.0 apps between Scala and Java
https://github.com/heroku/heroku-buildpack-scala/issues/13
Fix play 2.0 caching assertions
Merge pull request #17 from heroku/play-cache

Move play ivy cache drop after cache repacking
If Play 2.0 app type is unknown, just print empty string
instead of "Unknown"
Add additional play lang detection tests
Merge pull request #16 from heroku/play-lang-detect

Differentiate Play 2.0 apps between Scala and Java