Moves faker gem into all environments

Because I need it for Heroku
Enables run-time asset compliation, for Heroku

Because it's on the Cedar stack.
Revert "Enables run-time asset compliation, for Heroku"

This reverts commit 4579fbb38cef60df13bc08d5845cf64cb1e175d0.
Attempts to precompile assets in development for production

Because I'm tricksy like that
Sets default url host for Heroku

Because the mailer cant send without it
Revert "Sets default url host for Heroku"

This reverts commit 950633f0cc1a3bb3d35340549d8d7880ca612543.
Sets default url host for Heroku (attempt 2)

Because Heroku is so user friendly and easy to use
Set Host option in mailers.

Because heroku is so cool.
Set host option to heroku config in mailers.

It's better this way.