do not require Rake unless necessary

Gemfile

@@ -2,4 +2,4 @@ source "http://rubygems.org"
 
 gemspec
 
-gem 'rake'
+gem 'rake', :require => false

lib/guard/rails-assets.rb

@@ -1,6 +1,5 @@
 require 'guard'
 require 'guard/guard'
-require 'rake/dsl_definition'
 
 module Guard
   class RailsAssets < Guard
@@ -18,7 +17,6 @@ module Guard
 
     def reload
       runner.reload if runner.respond_to? :reload
-
       compile_assets if run_for? :reload
     end
 

lib/guard/rails-assets/rails_runner.rb

@@ -1,3 +1,4 @@
+require 'rake/dsl_definition'
 module Guard
 
   class RailsAssets::RailsRunner
@@ -59,9 +60,5 @@ module Guard
     def failed?
       @failed
     end
-
-    def restart_rails
-      fail "Not implemented"
-    end
   end
 end