Remove entirely base64 dependency

fastimage.gemspec

@@ -22,7 +22,6 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
   s.rubygems_version = %q{1.3.6}
   s.summary = %q{FastImage - Image info fast}
-  s.add_dependency 'base64'
   s.add_development_dependency 'fakeweb-fi', '~> 1.3'
   # Note rake 11 drops support for ruby 1.9.2
   s.add_development_dependency('rake', ">= 10.5")

lib/fastimage.rb

@@ -59,7 +59,6 @@ require 'net/https'
 require 'delegate'
 require 'pathname'
 require 'zlib'
-require 'base64'
 require 'uri'
 require 'stringio'
 

lib/fastimage/fastimage.rb

@@ -415,7 +415,7 @@ class FastImage
 
   def fetch_using_base64(uri)
     decoded = begin
-      Base64.decode64(uri.split(',')[1])
+      uri.split(',')[1].unpack1("m")
     rescue
       raise CannotParseImage
     end