Refactored measure visualization for measure logic view

### Stories ###
- https://www.pivotaltracker.com/story/show/65020512 (integrate measure visualization into UI)
- https://www.pivotaltracker.com/story/show/60159898 (apply rationale highlighting to visualization)
- https://www.pivotaltracker.com/story/show/67864906 (handle 30 ORs on one level)

### Notes ###
- updated styling and tweaked popover content for measure visualization

### Screenshots ###
- coverage
  - ![screenshot-localhost 3000 2014-08-14 11-50-07](https://cloud.githubusercontent.com/assets/456952/3922504/17f68344-23cb-11e4-9f13-436da1b696ae.png)
- rationale
  - ![screenshot-localhost 3000 2014-08-14 11-51-29](https://cloud.githubusercontent.com/assets/456952/3922503/17f56e32-23cb-11e4-982e-c776899ee752.png)