Mod 3 Changes

Refactored code from Mod 2. The sign in form is a non-model-backed
form, and I had been using bootstrap_form_for to render the form.
Refactored the code to use form_tag, which simplified the code, and
allowed user input to be saved and sent back to the form in the event
of invalid user input.
Mod 3 Updates

1. Added controller tests for videos#show and videos#search

2. Added controller tests for authentication

3. Added video reviews

4. Added capability for user to review a video
mod3 updates

1. Added blank argument to select method in select statement in
views/videos/show.html.haml, in order to get the label argument to work
properly.

2. Moved Fabrication and Faker gems to the :development and :test group
Merge pull request #4 from jlevinger/mod3

Mod3