Exception notifier, TOS pages, 500 hotfix

# Why?

 * Needed to fix #150 
 * Need to start getting emails when 500 errors happen
 * Needed terms of service

# What's next?

 * Need to write integration test for guides that will catch these kind of errors before deploy (speaking of which- our coverage is getting low- I might need to fix that this week)


Use the new Ruby 1.9 hash syntax.<br>Prefer single-quoted strings when you don't need string interpolation or special symbols.