finished models with validations for festival categories feature
added admin theme and finished festivals form
exclude paperclip uploads from git repo
Ordering home page by date and date display
finished search form and filters
Merge branch 'feature/home_page_festival_filters' into develop

* feature/home_page_festival_filters:
  finished search form and filters
  Ordering home page by date and date display
finished basic forms for spaces and events, added festival session storage
added admin theme assets and migration for festival dates
added csvs and seed data for categories