Add default legal terms/privacy pages.

Fixes #17

Changes:
* Add default views for footer/privacy/terms
* Add COMPANY_NAME env variable for configuring copyright, email, etc
* Add COMPANY_DOMAIN env variable for configuring default email
fix skipping erb eval
move mixpanel config into heroku
merge latest master
bump ruby version
update to master
Merge pull request #36 from thegarage/add-legal-pages

add-legal-pages