1.0-beta release

Beta release which incorporates fixes for usability issues identified in testing, as well as some minor bugfixes and other improvements.

• Adds success and error messages across the application
• Adds file manifest to transfer detail pages
• Adds detail modal to appraisal page and ability to delete appraisal note
• Refactors rights statement creation/edit into single page
• Improves show/hide of add and delete buttons for rights statements and BagIt Profiles formsets
• Improves help text on forms
• removes unnecessary templates
• Adds URL namespacing
• resolves use of auto_now and auto_now_add in model fields