Updating the $LogProvider to set another flag, that allows the user to h...

...ide all  $log.info() and $log.log() messages, but setting a flag in the config ($logProvider.enableMessages(false|true).  I haven’t gotten the tests to pass yet, there’s an error in the logSpec saying $LogProvider undefined.  

Can you advise on the logSpec tests?  I've tested just in my own code and the enableMessages() flag works, but I just wanted to have some jasmine tests written for it.

Thanks