Remove mimemagic as it now released under a GPL license, incompatible with Paperclip's MIT license

lib/paperclip.rb

@@ -64,8 +64,6 @@ rescue LoadError
   require "mime/types"
 end
 
-require 'mimemagic'
-require 'mimemagic/overlay'
 require 'logger'
 require 'terrapin'
 

lib/paperclip/content_type_detector.rb

@@ -60,18 +60,12 @@ module Paperclip
     end
 
     def type_from_file_contents
-      type_from_mime_magic || type_from_file_command
+      type_from_file_command
     rescue Errno::ENOENT => e
       Paperclip.log("Error while determining content type: #{e}")
       SENSIBLE_DEFAULT
     end
 
-    def type_from_mime_magic
-      @type_from_mime_magic ||= File.open(@filepath) do |file|
-        MimeMagic.by_magic(file).try(:type)
-      end
-    end
-
     def type_from_file_command
       @type_from_file_command ||=
         FileCommandContentTypeDetector.new(@filepath).detect

paperclip.gemspec

@@ -28,7 +28,6 @@ Gem::Specification.new do |s|
   s.add_dependency('activesupport', '>= 4.2.0')
   s.add_dependency('terrapin', '~> 0.6.0')
   s.add_dependency('mime-types')
-  s.add_dependency('mimemagic', '~> 0.3.0')
 
   s.add_development_dependency('activerecord', '>= 4.2.0')
   s.add_development_dependency('shoulda')