Mod2

Finished mod2 - tests for videos controller (show, search), users controller, sessions controller, reviews model and controller, queue_item model and controller (index, create, destroy)
Thanks for the feedback! I modified my code so that I'm now using the Rails built-in 'average' method, but I'm not sure if this solved the problem you mentioned of 'loading a lot of objects into memory' Aren't they essentially doing the same thing?