fix erb2haml rake task name

Author: indirect

lib/haml-rails/version.rb

@@ -1,5 +1,5 @@
 module Haml
   module Rails
-    VERSION = "0.8.0"
+    VERSION = "0.8.1"
   end
 end

lib/tasks/erb2haml.rake

@@ -1,5 +1,5 @@
 namespace :haml do
-  task :erb_2_haml do
+  task :erb2haml do
 
     puts "This task will generate a .html.haml translation of each of the  .html.erb files in app/views and its subdirectories."