Add login description + update header navigation

#### Stories ####
- https://www.pivotaltracker.com/story/show/69121414
- https://www.pivotaltracker.com/story/show/67683668

#### Notes ####
- updated login page with styles from https://github.com/carpeliam/bonnie-yeoman/commit/e0a4d0301dfdd2b1182408eb24a1e3673168c3ac
- updated header with indicator circles
- added navigation header to account edit page
- updated navigation bar active links on application navigation via <code>rendered</code> events

#### Screenshot(s) ####
- login screen
  - ![login](https://cloud.githubusercontent.com/assets/456952/2878964/db006e70-d463-11e3-8ef3-b457cffe9428.png)
- dashboard
  - ![dashboard](https://cloud.githubusercontent.com/assets/456952/2878963/db00291a-d463-11e3-9bb0-affbfca4c684.png)
- patient builder
  - ![patientbuilder](https://cloud.githubusercontent.com/assets/456952/2878961/dafffe7c-d463-11e3-9c3a-b747e2951bd3.png)
- results
  - ![results](https://cloud.githubusercontent.com/assets/456952/2878962/db000796-d463-11e3-945b-08c1ac7bd60f.png)
- account
  - ![account](https://cloud.githubusercontent.com/assets/456952/2878960/daffe338-d463-11e3-9cd8-b4ca169f5500.png)