Use mime-types 1.x for Ruby 1.8.7 compatibility.

Author: TimMoore

Gemfile

@@ -11,6 +11,9 @@ end
 group :test do
   gem 'childlabor'
   gem 'coveralls', '>=0.5.7', :require => false
+  # mime-types is required indirectly by coveralls
+  # needs to be < 2.0 to work with Ruby 1.8.7
+  gem 'mime-types', '~> 1.0'
   gem 'fakeweb', '>= 1.3'
   gem 'rspec', '>= 2.14'
   gem 'rspec-mocks', '>= 2.12.2'