Masquerading works

Remove some race conditions in user signups

Re-raise an integrity error during user creation if it's not caused by something we know to check for

Add a settings file for doing grabs for main_static. We may want to add COURSEWARE_ENABLED=False

Catch user integrity errors, and then try and figure out what caused them (which removes a race condition)

Rl announcement

Use inline if-else to cleanup HTML

The result from the normal if-else block has linebreak, which result in
poorly formatted HTML code. This should fix it and make the code looks
cleaner.

Email reword

Added new styles for tutorials