Page consistency

- Consistency between pages
- Move link twitter onto profile, beside `preference`
- Add events onto dashboard so people see it (re: #664, also remove events link from user nav. cc @despo)
- Better explanation on why new user is stuck on the preference page
  ![image](https://cloud.githubusercontent.com/assets/1153134/5241522/3ee223ba-78d4-11e4-9045-4a6010257cf0.png)

New - Old

![image](https://cloud.githubusercontent.com/assets/1153134/5241499/ad2fbe28-78d3-11e4-941d-5f8edec53b1b.png)

cc @andrew