Added details on endpoint.json and registering custom endpoints
Reword Notification vs. Message
Typo fixes
Fix spree version in 2.1.0 release notes.
Updating Push guide
s/integrator/hub
Zendesk Endpoint documentation
Correct 'Spree's Release Policy' section mention of branches
Fix side menu so that it stays open and displays correct icon

Fixes #161
Fixes to url and password params explanation - zendesk documentation
Updated Shipments API guide to reflect a working example. [#113]
Merge branch 'master' into add-spree-endpoint-stock-change-message