Removed Play distribution

The Play distribution is no more.  Included in this removal was:

* Removal of skeletons
* Removal of console project
* Removal of all custom SBT setup
* Removal of play and play.bat scripts
* Removal of all SBT tasks related to building the distribution
* Updated the migration guide to document how to obtain Play
Merge pull request #2539 from jroper/goodbye-play

Removed Play distribution
Incorporated sbt-web concerns into Play in order to reduce the repetition for sbt-web plugin configuration
Add products and other config