Core: minor changes: Java 7, compiler warnings & finals
Build: enable compiler warnings globally
Build: some libraries upgrade

ElasticSearch from 0.90.8 to 0.90.9
JClouds from 1.6.3 to 1.7.0
Liquibase from 3.0.8 to 3.1.0
MySQL from 5.1.27 to 5.1.28
Sked from 1.2 to 2.1