Update most deps required for Play 2.1-RC2 and Scala 2.10

Note this does not actually pass tests, and  no
"org.mongodb" %% "casbah-core" % "2.5.0" yet - but it's coming:

https://groups.google.com/d/topic/mongodb-casbah-users/Tiy9r2SMPcQ/discussion
Update Play request metrics for Play 2.1

Now using filters, and a bit more sane - the required configuration
is much more concise.

With a couple of tests too!