replace png to gif
edit sqlite3 to pg
Merge branch 'release/3.0.0.pre.0.2'

* release/3.0.0.pre.0.2:
  edit sqlite3 to pg
  replace png to gif
  remove bad files
  edit .gitignore
  add link to competition
  add favicon
  some fixes
  add background
  add accept_agreement
  remove empty stylesheets files
  remove empty js.coffee files
  edit locals
  remove spec
  fixes
  add gem enumerize
  add municipalities list
  replace district to municipality
  update gems
  fix precompile on production
Merge tag '3.0.0.pre.0.2' into develop

Edit SQLite to PostgreSQL

* tag '3.0.0.pre.0.2':
  replace png to gif