Added browser default engine
Added browser default engine

This should be replaced at some point with a more dynamic method of looking up platform engines.
apache/cordova-lib,dpogue/cordova-lib,shazron/cordova-lib,shazron/cordova-lib,apache/cordova-lib,dpogue/cordova-lib,apache/cordova-lib,shazron/cordova-lib,apache/cordova-lib,apache/cordova-lib,shazron/cordova-lib,dpogue/cordova-lib,dpogue/cordova-lib,shazron/cordova-lib,dpogue/cordova-lib,dpogue/cordova-lib,shazron/cordova-lib