Revert "add opt_in checkbox for 'request invite' form"

This reverts commit 4d8f44c3558883c805359c5ae18b28e72b759e77.
Allow gmail-style aliases
Navigation tweaks
Comment out social sharing
New landing page design
1Click submit + convert haml to erb
Error message hack
Update README
README - Fix screenshot paths
Update README
Update README
Update README
Update README (!!!)
Update README
Update README
Fix error handling hack [fixes #1]
Updated Rails
Merge pull request #2 from klinskyc/master

Updating Rails to Fix Vulnerability
Merged with 1click version