Fix Gem source_index issue

Ref:
 https://github.com/github/rails/commit/9adaec4b4f55c33efe6e358ba8c55bbc7ebbce48
Establish green baseline by skipping failing tests

Becouse YOLO.
Potential XSS Vulnerability [CVE-2012-3464]

https://groups.google.com/forum/#!msg/rubyonrails-security/kKGNeMrnmiY/r2yM7xy-G48J
Unsafe Query Generation Risk [CVE-2013-6417]

Incomplete fix to CVE-2013-0155

https://groups.google.com/forum/#!topic/rubyonrails-security/niK4drpSHT4
Add README [ci skip]