Merge tag '1.4.2' into develop

* Added ability to use a per-user config file without project specific config
* Moved to using call_user_func($callback) over $callback() for PHP 5.3 compatibility
* Added basic FromCurl module for making HTTP requests
* Added FromFacebook and UsingFacebookGraphApi modules
Update install instructions in README
Fix: Update README with information about common issues + how to fix them