Fix "superclass mismatch for class CustomParser (TypeError)" when run…

…ning tests

This error would occur when spec/httparty_spec.rb was loaded before
spec/httparty/parser_spec.rb.

This is less likely to happen on OSX than on Linux, because Dir.glob on OSX
returns items sorted alphabetically, whereas on Linux the ordering depends on
the underlying filesystem ordering.

spec/httparty/parser_spec.rb

@@ -1,7 +1,5 @@
 require File.expand_path(File.join(File.dirname(__FILE__), '..', 'spec_helper'))
 
-class CustomParser < HTTParty::Parser; end
-
 describe HTTParty::Parser do
   describe ".SupportedFormats" do
     it "returns a hash" do

spec/httparty_spec.rb

@@ -1,6 +1,6 @@
 require File.expand_path(File.join(File.dirname(__FILE__), 'spec_helper'))
 
-class CustomParser
+class CustomParser < HTTParty::Parser
   def self.parse(body)
     return {:sexy => true}
   end