Carrierwave direct uploads

This isn't 100% complete, and the upload form and file list are simple admin facing pages.  But with valid S3 credentials configured in fog.yml, you can upload a file directly to Amazon S3.

Still outstanding:
 * find a way to get the file size information from Amazon to log how big a new file is
 * prevent users from uploading anymore files when their total excedes the upload limit
 * figure out relationship between uploaded files and other models (eg: team photo vs game uploads, vs screenshots)
 * clean up views to accomodate new relationships and remove jammer access to file list