Merge pull request #59 from cvogt/topic/implicitSessions

piggybacks slick session onto play request, reducing boilerplate
execution context fix and test
Update README.md

setup
Merge pull request #65 from odwrotnie/master

Setup explained
Merge remote-tracking branch 'origin/master' into topic/closerToSlick

Conflicts:
	src/main/scala/play/api/db/slick/SlickExecutionContext.scala
reintroduces Config object for clarity, make Database compare well (by making it an ordinary class)
renames files for clarity, improves slick hook comment