Add views and tests for a branches selector.

Review Request #4321 — Created July 11, 2013 and submitted — Latest diff uploaded

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Review Board
master

Reviewers

Add views and tests for a branches selector.

This change adds views to show a RepositoryBranchesCollection using a <select>
tag. This is used in the new post-commit review request creator.
- Ran unit tests.
- Used this in my post-commit UI.