reactive-mongo: replaced val by lazy val for collection initialization
remove defunct resolvers for Datomisca
generalize collection type for find and findStream in AutoSource trait

- nothing more precise than TraversableOnce is really needed
- propagate changes to Datomisca and ReactiveMongo
- clean up a few implicits in ReactiveMongoAutoSource
Merge pull request #20 from dwhjames/topic/find-TraversableOnce

Use more general collection traits in AutoSource trait
Merge remote-tracking branch 'origin/master' into exp-2.0

Conflicts:
	reactivemongo/samples/sample-angular/app/controllers/Application.scala
	reactivemongo/src/main/scala/ReactiveMongoAutoSource.scala
created AbstractJsValueAutoSourceController with ActionBuilder hooks