Conflicts:

	api/users.rb
	models/user.rb

Update generate_comments_for so that it actually generates multiple levels of comments, up to the maximum nesting level.

Add endoresed information for threads.

Performance tuning

This is kind of a hack and I'm not sure why it's undefined in the Rake task
because it works when running the app, and #{field}_changed? is defined by
Mongoid as part of its dirty tracking implementation.

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