Cross-build with Scala 2.11.1

- Enable cross building with Scala 2.11.1
- * Remove lift-json integration due to the lack of Scala 2.11 support (yet)
- Fix deprecation warning for Scala 2.11.1
- Update dependencies

There are a few options for lift-json integration:
1. Just remove until it gets 2.11 support
2. Maintain different branches for Scala 2.10 and 2.11, and remove lift-json from only 2.11 branch
3. Just wait until lift-json gets 2.11 support

What do yo think?