Catches origin mismatch error and informs user

When there is an origin mismatch error, this is most likely because a user is running IPython notebook on a port other than 127.0.0.1 or a port not in the range 8888 to 8899.  This commit adds a warning message informing the user of this requirement, and directing them to the github repo issue for more info.
Merge pull request #36 from KesterTong/origincheck

Catches origin mismatch error and informs user