[#ASSIST-5] Cleaned up sponsor editing form.

- Converted form to haml, since we have it, and it's a lot cleaner
- Removed the partial and moved its content directly into the edit view,
  since the partial isn't being used in multiple places.
[#ASSIST-5] Added email to sponsor page

- Added email to the sponsor edit page
- Removed the db/schema.rb file, since Rails now uses db/structure.sql
[#ASSIST-5] Re-annotated models.
Merge branch 'master' into 5-email-workflow