feat(TableScanner): Use class-based Logger instead of play.Logger

 DDL scanning should be in the play.api.db.slick.ddl namespace; this allows runtime configuration of logging instead of blasting out the 'application' namespace.

fix(plugins.sbt): default to latest play.
Merge pull request #124 from Damiya/master

feat(TableScanner): Use class-based Logger instead of play.Logger