Merge pull request #56 from stoe/develop

JShint fixes, changelog, contributing & minor changes
Fix for issue #50.

I had carlessly used "id" as a model field name. On sorting the grid, the store pruned any "duplicate" records.
Merge pull request #57 from arthurakay/master

Fix for issue #50.
Release checklist per issue #55
Merge pull request #58 from arthurakay/master

Release checklist per issue #55