Made ui-codemirror work with updateOn: 'blur'

[jasonreich]

Adjusted slightly to respect "updateOn" ngModelOption attributes. Previously, if one specified {updateOn: 'blur'}, the model would never update.

The specific changes are;

1. A modification of `src/ui-codemirror.js' to add the necessary debounce and commit code (follows that in angular's ngmodel directive).
2. An additional unit test for the {updateOn: 'blur'} case.

[floribon]

+1 this is really needed, has uiCodemirror development being abandoned?

[boutils]

Workaround here:

$scope.editorOptions = {
    onLoad: function(editor) {
        editor.on('blur', function() {
            $scope.myModel = editor.getValue();
        })
    }
}