Removed gender from user profile.

This pull request does the following:
Removes gender from user profile.
Adds negitivezero to user list.

The reviewer should start by:
 Reviewing the diff. These changes are pretty trivial.

I performed the following manual test. Visit the edit profile page, visit the user profile page. Both pages displayed without any errors and without showing anything about gender. (Note: without review more of the sites code I am not sure that they would have shown up anyway. I did not test run the site until after I made the changes.) 

It closes this issue: #289