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
added meetmantra's logo to source images about and added them to users.yml
add a cookbook on displaying relative dates
Added heads up about computed properties to  'marking a model as complete-incomplete' page.

When a person reads this for the first time, he is left wondering why this function calls `property`. Even if there's a resource link in the bottom, it would nice to give a small heads up of whats going on up there.
Swap true result for false on template boolean check

I'm just getting started with Ember, but my results differed from the docs here. Is this right?
added instructure to ember users
hid cookbook from guide
Add anchors to API headers
Update to reflect example and new query syntax
Update link to TodoMVC page
Merge pull request #862 from balinterdi/update-todomvc-link

Update link to TodoMVC page
Update creating_reusable_social_share_buttons.md
Fix integration testing docs on keyEvent

The function is `keyEvent`, not `keyDown`.
https://github.com/emberjs/ember.js/blob/master/packages/ember-testing/lib/helpers.js#L49
Bugfix Setting Computed Properties

The example at "Setting Computed Properties" tries to split a non existing variable fullNameString.
controllers are no more instantiated on App NS
spelling fix
Merge pull request #868 from zzzev/patch-1

Tiny little spelling fix in docs