Merge pull request #198 from just3ws/master

Split up the actual sending of the emails to speed things up
fix #304: Previewing a protip in firefox doesn't hide back of the card
Fix the Assembly banner text
I added an em-dash and removed "so" so that the text reads better.
Merge pull request #202 from just3ws/master

Restore subject prefix
Merge pull request #201 from Pletcher/master

Fix the Assembly banner text
Merge pull request #199 from unstop/master

fix #304: Previewing a protip in firefox doesn't hide back of the card