fixing broken link in CONTRIBUTING
http://help.github.com/send-pull-requests/ is no longer supported this change modifies the link to the working one https://help.github.com/articles/creating-a-pull-request/
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http://help.github.com/send-pull-requests/ is no longer supported this change modifies the link to the working one https://help.github.com/articles/creating-a-pull-request/