Add cross-compile support for Scala 2.11.1

I built a version of Scoobi from Eric's 2.11 branch. The tests all seem to work locally.

I'm assuming the biggest problem will be the blackbox macro stuff. In that it isn't backwards compatible with 2.10. I'm assuming this is what you meant by deprecated warnings Mark. :(

/cc @markhibberd @etorreborre 

> I think this is actually redundant, need to check but I have a vague recollection that -Ywarn-all is just an alias for -Xlint in 2.10.

Looks like it:

https://groups.google.com/forum/#!topic/scala-user/KyGB2Y5Z84o

> From the source it appears that -Ywarn-all has been identical to -Xlint for a long time, possibly due to a copy-paste error. So you're not actually losing anything. See the source in 2.9.3 and 2.10.3