Support MultiJson 1.2 for Rails 3.0 and 3.1

Should fix #247
Add tests for more YAML methods
Check for more YAML methods

Closes #246
Merge pull request #249 from presidentbeef/add_more_yaml_methods

Check for more YAML methods parsing user input
Merge pull request #248 from presidentbeef/support_older_multi_json

Support MultiJson 1.2 for Rails 3.0 and 3.1
Add tests for update_all SQLi
Check for SQLi in ActiveRecord::Relation#update_all

http://api.rubyonrails.org/classes/ActiveRecord/Relation.html#method-i-update_all
Merge pull request #253 from presidentbeef/check_for_update_all

Check for ActiveRecord::Relation#update all
Rename duplicate test methods
Remove double spacing in generated tests
Minor code cleanups
Add file to YAML parsing warning
Clarify 2.x warning for CVE-2013-0155
Checks for some Object#send variants
Porper naming
I guess all in the original module is much cleaner
Add tests for more send-like methods
Add tests for CVE-2013-0333
Add check for CVE-2013-0333
Fix yalj -> yajl in CheckJSONParsing