Rails 5: Fix obsolete Mime Type constants
Rails 5: Fix obsolete Mime Type constants

See https://github.com/rails/rails/commit/2a3718f434ac9dfeac3473c41a78d81aba9dbc1b

Signed-off-by: Alex Coles <60c6d277a8bd81de7fdde19201bf9c58a3df08f4@alexbcoles.com>

apotonick/roar-rails