Fix broken configuration watching #11
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$scope.$watch() only works on single expressions, not arrays.
Instead, use $scope.$watchGroup(). As this functionality was
introduced in Angular.js 1.3, also bump the minimum dependency and
the version used in the demo to that version. This was found over
in https://github.com/nebulous/infinitude and was causing the dial
to display incorrectly when using an expression for scaleMax that
wasn't ready when the dial was first drawn.