Add Support for github.com

[ZeroDot1]

https://api.github.com/search/repositories?q=google.com https://gist.github.com/search?utf8=%E2%9C%93&q=google.com

[screetsec]

In this case, we cannot find a subdomain if we only use the link source. The URL you use to find the repository that contains the sentence google.com, maybe we should try to parse the source repository. this take a long tiime to parse and regex