Update readme to prevent common installation error

To resolve the following error:
http://stackoverflow.com/questions/27094896/recaptcharecaptchaerror-in-registrationscontrollercreate/27316798#27316798
I've just commented out the proxy configuration line as most people don't use a proxy but DO blindly copy code from readme's (myself included! :)
Merge pull request #113 from lewispb/patch-1

Update readme to prevent common installation error