Remove the listener once the event has fired, this eliminates duplicate listeners from firing when only the callback should be.
Remove the listener once the event has fired, this eliminates duplicate listeners from firing when only the callback should be.

Signed-off-by: Nick Campbell <4e5fa59972f8e7e243419309ef9acdc825955a44@siteworx.com>

ncb000gt/node-googleanalytics