First steps towards using Rails' asset pipeline.

Asset pipeline has been enabled. Rails should look in app/assets now for images/javascripts/stylesheets.
Only some images and javascript files have been moved. Others will be brought over as necessary if a suitable replacement/gem isn't found.
Moved application-wide to a new file in app/assets.

Asset pipeline loads all stylesheets required by application.css.
Use default devise session controller for now.

Special twitter/facebook authentication can't be done yet. Form also had to be changed because it would throw 'undefined method: 'users_path.''
Fixed references to the small images that needed to be loaded.

Icons used to live in /icn/ inside the public/images folder. Now they are just in app/assets/images for loading by the asset pipeline.
Moved prototype.js to app/assets folder.

Prototype may just end up being replaced or removed. If its functionality is critical to the app, I'll get around to making it work but right now I think it doesn't offer anything critical to the app.
Fixed header layout to use devise user session checking.

Devise uses 'user_signed_in?' to determine if a user is logged in, replacing the old plugin's 'logged_in?'.
A debug logging message was added for now.
Fixed javascript loading. Params are appended to urls when submitting forms though.

'application.css' isn't loaded automatically for some reason, so it needs to be explicitly included.
'prototype.js' is a javascript framework akin to jQuery that should eventually be removed.
'jquery' is included in with rails by default as of Rails 3.1.
Can't find where default javascripts are set and it doesn't seem to affect the main page or signup/login forms.
Added a small check for asset loading to suppress non-error messages for assets being loaded in the development environment.