Merge pull request #135 from sdeleuze/master

Fix issues #133 and #134, add missing return this and add a VERSION property to RESThub
Merge pull request #138 from sdeleuze/master

Merge instead of replace behaviour for default render context
Merge pull request #139 from sdeleuze/master

Remove uneeded unbind + validation during save fixes
Fix Backbone localstorage adapter