Timeout

The timeout function was recently added to technoweenie/node-scoped-http-client and we need this feature for the Hubot build command as sometimes the build is taking more than the default 2 minutes.  I have merged technoweenie/node-scoped-http-client into our fork under the timeout branch.  I have already tested this locally with different timeout values, but please take a look and let me know what you think.