Fix bug with assignment public methods in 1.8.7

Author: gazay

lib/gon.rb

@@ -48,7 +48,7 @@ def request=(request_id)
 
     def method_missing(m, *args, &block)
       if ( m.to_s =~ /=$/ )
-        if public_methods.include? m.to_s[0..-2].to_sym
+        if public_methods.include?(RUBY_VERSION =~ /1.9/ ? m.to_s[0..-2].to_sym : m.to_s[0..-2])
           raise "You can't use Gon public methods for storing data"
         end
         set_variable(m.to_s.delete('='), args[0])

spec/gon/gon_spec.rb

@@ -62,6 +62,7 @@
   it 'returns exception if try to set public method as variable' do
     Gon.clear
     lambda { Gon.all_variables = 123 }.should raise_error
+    lambda { Gon.rabl = 123 }.should raise_error
   end
 
   context 'render json from rabl template' do