Update firefox to use latest version

Also stops installing it for the testing environment, since we're using
Sauce Labs on Jenkins

I tested this locally and all of the UI tests passed

Fixes #108
Add Species model, link it to Tree

We will likely change this in the future once we get a full species list
Merge pull request #110 from maurizi/fix-vagrant-up

Update firefox to use latest version
Add block, tree, and species counts to user profile page

Also undecorates the view function and in favor of decorating it with
a separate name, for greater testability
Merge pull request #111 from maurizi/show-counts

Show counts on user profile page
Add basic group detail page

The rough layout was inspired by the wireframes.
Add a form to edit group settings

I followed an often used convention of using /model/{id}/edit/ as the
url for displaying the form. The form POSTs back to /model/{id}/edit/
and then redirects to /model/{id}/ on success.