Adds voting overview skeleton

Provides the overall progress bar and a table with the requirements and individual progress bars. The table uses a list of RequirementEstimates to back it and can return the selected requirement. Functionality can be tested by running VotingOverviewDemo.java as a Java Application.

![capture](https://cloud.githubusercontent.com/assets/6981284/2747089/df5d9f22-c759-11e3-9590-6cbc0baaf4eb.JPG)