Remove require to rake and devise version from Rakefile

Rakefile

@@ -1,9 +1,7 @@
 # encoding: UTF-8
 
-require 'rake'
 require 'rake/testtask'
 require 'rake/rdoctask'
-require File.join(File.dirname(__FILE__), 'lib', 'devise', 'version')
 
 desc 'Default: run tests for all ORMs.'
 task :default => :pre_commit
@@ -33,4 +31,4 @@ Rake::RDocTask.new(:rdoc) do |rdoc|
   rdoc.options << '--line-numbers' << '--inline-source'
   rdoc.rdoc_files.include('README.rdoc')
   rdoc.rdoc_files.include('lib/**/*.rb')
-end
+end