Allow searching by Sexp in Brakeman::FindCall

but seriously we need to kill this
Add tests for CVE-2013-0156
Add check for CVE-2013-0156
Forgot to adjust expected warnings
Add version check for CVE-2013-0155
Merge pull request #239 from presidentbeef/add_even_more_CVEs

Add checks for CVE-2013-0155 and CVE-2013-0156