Allow compilation w/ JDK 8 on 2.2

With 2.2 being the current version and JDK 8 released, one should be able to compile
with a 1.8 JDK.

* Upgrade spring from 3.2.0 to 3.2.7 (ASM handling changes etc)
* Preseve ordering of reacheable elements (plucked from ef0823)
* Added the PooledEmbeddedDataSource to address the issue outlined in
  SPR-11372 (plucked from b27823)