Fix for bug id  994089 [Add XMPP account type]

Bug ID: 994089 

I only made changes in file mozillians/users/models.py, but i don't know why other 16 files were in this commit. I think i have some problems with git :(.
This is my first bug and I followed instructions on this two sites
http://mozillians.readthedocs.org/en/latest/installation/installation-virtualenv.html
and
http://mozillians.readthedocs.org/en/latest/contribute.html
but when i type "git status" it gave me also these 16 files that were changed.
I need a little help.
Thanks.