Marc: Add me to contributors in publish.sbt

Marc: add my email to publish.sbt
Import play-slick-iteratee-sample from scalaquery-play-iteratees
extract slickVersion in build.sbt to be shared with slick-testkit
add test dependencies on slick-testkit and mockito
Fix imports in sample app
First light on integration: first test passes, converted to specs2
Convert a bunch more tests to specs2
Convert the two tests where downstream Enumeratee fails to specs2
Convert tests of read consistency to specs2
Convert tests of logging callbacks to specs2
Convert PlayLogCallbackUnitTest to specs2
Wait only 1 second (as 5, when tests fail, is a long wait)
Do not run tests in parallel, in order to use H2 from more than one test
Workaround H2 driver error due to H2 use in another test
Renames ScalaQuery -> Slick
Clarify return None using explicit if/else rather than filter
Make private SessionWithAsyncTransaction#hasTransactionFailed
Clarify error handling logic to close async transactions
Code style: replace procedure syntax with Unit return type

See http://docs.scala-lang.org/style/declarations.html#procedure_syntax
(cosmetic: clean up white space and comment)