Fixed an error in self.off method
[ci skip]
Changed the Grunt port to 8081. It's a workaround to a Sauce Labs [bug](https://github.com/axemclion/grunt-saucelabs/issues/100).
First version of iris debug mode
New iris.isLocalhost. Enable iris.debug in localhost by default.
Improved iris debug styles
Updated doc: iris.isLocalhost and iris.debug
Merge from dev branch to include iris debug mode