User first_name, last_name, and telephone display correctly in Account page

#### Story ####
- https://www.pivotaltracker.com/story/show/65111524

#### Notes ####
- Updated User model to denote <code>first_name</code>, <code>last_name</code>, and <code>telephone</code> as accessible attributes, thereby allowing them to be saved to the database on registration and persisted to the Account page

#### Screenshot ####
![usernames](https://f.cloud.github.com/assets/456952/2112018/bcf1e0b0-9018-11e3-87f9-8f51608839a4.png)