Fix all rubocop warnings

lib/paperclip/attachment_extensions.rb

@@ -8,7 +8,7 @@ module Paperclip
 
     # monkey-patch to avoid unlinking too avoid unlinking source file too early
     # see https://github.com/kreeti/kt-paperclip/issues/64
-    def post_process_style(name, style) #:nodoc:
+    def post_process_style(name, style) # :nodoc:
       raise "Style #{name} has no processors defined." if style.processors.blank?
 
       intermediate_files = []
@@ -16,16 +16,14 @@ module Paperclip
       # if we're processing the original, close + unlink the source tempfile
       intermediate_files << original if name == :original
 
-      @queued_for_write[name] = style.processors.
-                                inject(original) do |file, processor|
+      @queued_for_write[name] = style.processors.reduce(original) do |file, processor|
         file = Paperclip.processor(processor).make(file, style.processor_options, self)
         intermediate_files << file unless file == original
         file
       end
 
       unadapted_file = @queued_for_write[name]
-      @queued_for_write[name] = Paperclip.io_adapters.
-                                for(@queued_for_write[name], @options[:adapter_options])
+      @queued_for_write[name] = Paperclip.io_adapters.for(@queued_for_write[name], @options[:adapter_options])
       unadapted_file.close if unadapted_file.respond_to?(:close)
       @queued_for_write[name]
     rescue Paperclip::Errors::NotIdentifiedByImageMagickError => e

lib/paperclip/gif_transcoder.rb

@@ -109,7 +109,7 @@ module Paperclip
       final_file = Paperclip::Transcoder.make(file, options, attachment)
 
       if options[:style] == :original
-        attachment.instance.file_file_name    = File.basename(attachment.instance.file_file_name, '.*') + '.mp4'
+        attachment.instance.file_file_name    = "#{File.basename(attachment.instance.file_file_name, '.*')}.mp4"
         attachment.instance.file_content_type = 'video/mp4'
         attachment.instance.type              = MediaAttachment.types[:gifv]
       end

lib/paperclip/type_corrector.rb

@@ -7,7 +7,7 @@ module Paperclip
     def make
       return @file unless options[:format]
 
-      target_extension = '.' + options[:format]
+      target_extension = ".#{options[:format]}"
       extension        = File.extname(attachment.instance_read(:file_name))
 
       return @file unless options[:style] == :original && target_extension && extension != target_extension