Instead of -infinity use NULL for date_joined and default to now()
Add the database tables and models for warehouse.accounts
Start working on a user profile page

* Adds a gravatar_url helper function
* Adds a view that will render a profile page for a user
* Adds a basic template to start with
Add models and tables to allow fetching all packages a user has a role for
List the projects a user has roles for on their project page
Update render_response tests to handle gravatar_url
UnicodeText cannot accept the length parameter
Properly generate the join
We need only a simpler heading
Remove unused import
Match the new naming scheme
Rename user_detail to user_profile
Enable caching with Fastly
Test the user profile feature and the support code for it

* Tests include
  * account models
  * packaging models
  * account views
* Fix bugs identified in testing
style fixes
Merge pull request #113 from dstufft/user-profile

Add a user profile view