Handle logged out users better

When they try to reach areas they need to be logged in to access
Refactored home button gradiants, fixes #34

Using built-in compass linear gradiant functions
Added the quiet_assets gem in development

It removes logging of all asset loads in development, greatly cleaning
up the log output.
Updated Rails to 3.2.13
Merge branch 'button-gradiant' of git://github.com/andrew/codemontage into button-gradiant
Merge branch 'quiet-assets' of git://github.com/andrew/codemontage into quiet-assets
update Rails, Zurb Foundation, & dependencies