Split careers into multiple pages
Add new copy to careers page
Link to Soapbox article
Style info-boxes on career page
Finish off career page

-Add developer page and position
-Style email us message
-Simplify design on perks
More specific nav active state
Style position detail pages
Copy changes from Michelle
Typo on email us from career page
Use mail_to helper
Merge pull request #132 from gaslight/update-careers

Update careers