Merge pull request #1367 from priand/playground2

Playground2
[Added] sbt fragment plugin
added new fragment to the playground sample 
the playground feature includes the new fragment
Merge pull request #1368 from LorenzoBoccaccia/add-fragment

[Added] sbt fragment plugin
Merge remote-tracking branch 'upstream/master' into playground2
Moved the sbt specific classes from core playground to the sbt fragment