#1312: Compromise on home link, improving progress navbar link

Fixes the following issues:
* Contentious #1312: Keep the HOME navbar link.
* Make the username nav link into a static "My Progress"
* Bring back the site points text
* Show the username info by the site points.
* Remove language selector - it should only be set once, and is now available for edit in the "edit account preferences" link.
* Show help for all users.

@heidimason please help with the sitepoints text

Student with points:
![screen shot 2014-04-01 at 11 12 53 pm](https://cloud.githubusercontent.com/assets/4072455/2587933/11586940-ba2f-11e3-9f2b-4f08713d0ff3.png)

Admins, teachers, and students with no points:
![image](https://cloud.githubusercontent.com/assets/4072455/2587936/203998a8-ba2f-11e3-9e0f-35b707fcd513.png)