Add link_to_ajax_cart helper for Spree

1. Add the following to your Gemfile

  gem 'spree_ajax_cart', '~> 1.2.0'

2. Run bundle install
3. To copy and apply migrations run:

	rails g spree_ajax_cart:install

1. add new link to cart nav menu:

	<%= link_to_ajax_cart("Custom Text") %>

Copyright (c) 2012 [Damiano Giacomello], released under the New BSD License