Update Redirecting section in Routing guide

 * The `redirect` hook is now deprecated in favor of `beforeModel` and `afterModel`.
Custom JSON Transforms : Update sample code

The 'registerTransform' method has been removed, and there is a new
way to register a custom JSON transform.
Add back and bring up-to-date filtering section in Redirecting guide
Add section headers to Redirecting guide
add a cookbook on displaying relative dates
Update to reflect example and new query syntax
Add guide for Handling Metadata
Add Ember(/Data) canary warnings
make doc consistent with code (references aliased property instead of binding)
[cookbook] Formatted dates -- computed property bind to date and format

The example property is currently only bound to format.
Add promise debugging information to Guides.
Merge pull request #935 from rjackson/update_debugging_guide

Add promise debugging information to Guides.
Update pluralization customization for adapter to use Ember.Inflector
Merge pull request #936 from uversity/update_adapter_pluralization_customization

Update pluralization customization for adapter to use Ember.Inflector
Update users.yml
Create khelkund.png
Delete khelkund.png
added khelkund to the users list
Merge pull request #937 from vinay3206/master

Adding KhelKund.com on ember listing
Fix missing var