Update deciding_if_a_recipe_is_a_good_fit.md

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Update index.md

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Update participating_if_you_dont_know_ember.md

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Update participating_if_you_know_ember.md

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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