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

Migrate usernames to be free of unsupported characters.

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