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?
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
controllers are no more instantiated on App NS
Update deciding_if_a_recipe_is_a_good_fit.md

update copy.
Update index.md

copy changes
Update participating_if_you_dont_know_ember.md

copy changes
Update participating_if_you_know_ember.md

copy changes
Update suggesting_a_recipe.md

copy changes
Update understanding_the_cookbook_format.md

copy changes
Added radflex.pt to Ember Users.
Rename linkPrefix to 'channel'.
Make Project model.
Merge pull request #871 from twokul/master

updating setter example
Use new App.Project for filtering.

@twokul / @rjackson
Merge pull request #870 from cascalheira/master

Added radflex.pt to Ember Users.
Add description for each channel in /builds.

@twokul / @rjackson
Provide actual download link.
Merge branch 'master' of github.com:zachpendleton/website

Conflicts:
	source/guides/cookbook/contributing/deciding_if_a_recipe_is_a_good_fit.md
	source/guides/cookbook/contributing/participating_if_you_dont_know_ember.md
	source/guides/cookbook/contributing/participating_if_you_know_ember.md
	source/guides/cookbook/contributing/suggesting_a_recipe.md
	source/guides/cookbook/contributing/understanding_the_cookbook_format.md
Merge pull request #874 from zachpendleton/master

Update cookbook documentation