Upgrade to GXT 3.1.1 and GWT 2.6.1
Merge branch 'JAVA-20' into feature/GFD
GWT Separation: step 1 - frontend module moved outside modules structure
GWT Separation: created masterpom for gwtfronted. Pending to clean materpoms.
GWT separation: Removed unnecesary dependency
GWT separation: cleaned GWT master pom and fixed wrong version for a gwt pom
GWT Separation: front-facade json is now "GWT free"
GWT Separtation: Created front-facade-gwt-json. This module will be use for GWT JSON and will remove resty dependency from core-api
GWT Separation: Removing GWT references from core api
GWT Separation: removed RestyGWT dependency from core-api
GWT separation: cleaning poms
Version changed to 1.5-SNAPSHOT
gwt frontend version changed to 1.0-SNAPSHOT