More updates for the application detail screen (does not yet have validation on the backend)
Added prior grade/school info to application detail
Removed an unused CSS class
Added some validation checks for student fields on application detail
Enabled file uploads for supplemental materials (using Paperclip gem)
Merge branch 'paperclip' into admin-first-draft
Fixed some errors in Seeds file, created by Paperclip migration.
Merge branch 'master' into admin-first-draft
Added validation, saving, and display of errors to Application Detail page
Merge branch 'master' into admin-first-draft

Conflicts:
	Gemfile.lock
Not sure what changed in the Gemfile.lock, but looks harmless.
Added 'bring documentation' as a type to supplemental materials
WIP application process screen
Display functionality for the application processing
Added action that processes an application
Cleaned up the district model. Renamed fields and removed first day of school field.
Removed confirmation screen after processing an application from the admin side. Wasn't needed.
Removed duplicate screen for editing district info
Added district info section to district admin screens
Added supplemental materials for districts, but also refactored central to use the same code.