Merge pull request #141 from sdeleuze/master

Fix Backbone Associations dependency
Merge pull request #142 from sdeleuze/master

Fix war packaging configuration
[maven-release-plugin] prepare release resthub-backbone-stack-2.1.2
[maven-release-plugin] prepare for next development iteration
Change synchronization policy of validation api
unset is not a valid function
Merge pull request #143 from pierre-duchesne/master

Change synchronization policy of validation api
Rollback version
Proposal to fix issue #145