Upgraded sbt version to 0.12.0
Update README.md

Updated readme for sbt 0.12.x
bumped up the version after upgrading to 0.12.x
Added min, max heap size and supported platform settings
Removed hard coded credentials
added sample project test deps
1) Implemented additional deps copying.
2) Bumped the plugin version to 0.2.2
Merged conflicts
Added ivy credentials file again