Cleanup usernames (fix bug 737263)
Cleanup usernames (fix bug 737263)

Migrate usernames to be free of unsupported characters.

safwanrahman/mozillians,fxa90id/mozillians,akatsoulas/mozillians,brian-yang/mozillians,johngian/mozillians,hoosteeno/mozillians,justinpotts/mozillians,glogiotatidis/mozillians-new,mozilla/mozillians,akarki15/mozillians,ChristineLaMuse/mozillians,brian-yang/mozillians,akatsoulas/mozillians,akatsoulas/mozillians,mozilla/mozillians,brian-yang/mozillians,fxa90id/mozillians,anistark/mozillians,satdav/mozillians,chirilo/mozillians,brian-yang/mozillians,ChristineLaMuse/mozillians,akatsoulas/mozillians,mozilla/mozillians,hoosteeno/mozillians,satdav/mozillians,glogiotatidis/mozillians-new,hoosteeno/mozillians,glogiotatidis/mozillians-new,mozilla/mozillians,satdav/mozillians,chirilo/mozillians,satdav/mozillians,ChristineLaMuse/mozillians,anistark/mozillians,fxa90id/mozillians,akarki15/mozillians,anistark/mozillians,anistark/mozillians,chirilo/mozillians,safwanrahman/mozillians,safwanrahman/mozillians,johngian/mozillians,justinpotts/mozillians,akarki15/mozillians,akarki15/mozillians,justinpotts/mozillians,justinpotts/mozillians,fxa90id/mozillians,safwanrahman/mozillians,johngian/mozillians,chirilo/mozillians,hoosteeno/mozillians,johngian/mozillians,glogiotatidis/mozillians-new