Merge pull request gazay#22 from Bushjumper/master

Resolve Issue gazay#19

Author: gazay

README.md

@@ -126,6 +126,14 @@ alert(customNamespace.yourHash)
 Now you can write your variables assign logic to templates with [Rabl](https://github.com/nesquena/rabl).
 The way of writing Rabl templates is very clearly described in their repo.
 
+Add Rabl to your Gemfile
+
+  `Gemfile`
+
+  ``` ruby
+  gem 'rabl'
+  ```
+
 Profit of using Rabl with gon:
 
   1. You can clean your controllers now!

gon.gemspec

@@ -19,8 +19,8 @@ Gem::Specification.new do |s|
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   s.require_paths = ["lib"]
   s.add_dependency "actionpack", '>= 2.3.0'
-  s.add_dependency "rabl"
   s.add_dependency "json"
+  s.add_development_dependency "rabl"
   s.add_development_dependency "rspec"
   s.add_development_dependency "jbuilder"
 end

lib/gon.rb

@@ -4,7 +4,9 @@
 require 'action_view'
 require 'action_controller'
 require 'gon/helpers'
-require 'gon/rabl'
+if defined?(Rabl)
+  require 'gon/rabl'
+end
 if RUBY_VERSION =~ /9/ && defined?(Jbuilder)
   require 'gon/jbuilder'
 end
@@ -58,6 +60,9 @@ def set_variable(name, value)
     end
 
     def rabl(view_path, options = {})
+      if !defined?(Gon::Rabl)
+        raise NoMethodError.new('You should define Rabl in your Gemfile') 
+      end
       rabl_data = Gon::Rabl.parse_rabl(view_path, options[:controller] || 
                                                   @request_env['action_controller.instance'] || 
                                                   @request_env['action_controller.rescue.response'].