added dropbox support for sufia, only needs the dropbox api key and the upload screen will provide a drobox chooser as well.  Updated the javascript tooltip from bootstrap when users hover over the upload button without agreeing to the deposit agreement.  Changed the terms of service agreement to be ready for additional tabs to do uploads/imports beyond dropbox. I also realized the import_url_job file name was spelled incorrectly.
Merge pull request #135 from psu-stewardship/db

added dropbox support for sufia, only needs the dropbox api key and the ...