Updating to GWT 2.5.0-rc1
Updated GWT dep to 2.5.0 proper
Updated pom versions for the GXT3-Sandbox branches
Removed unnecessary repository
CORE-4185: Implement analysis launch. 
Added JSON pretty print convenience functions to JsonUtil
Merge branch 'gxt3-sandbox'
Revert version and dependencies to dev-SNAPSHOT.
Merge branch 'master' into STABLE
Versioned as part of Release Candidate for v1.8