States declaration hash should accept anonymous functions

[Fab1en]

Callbacks are defined by function names (string) :

states: {
    visible: {enter: ['doShow'], leave: ['doHide']},
},
doShow: function() { this.el.show(); },
doHide: function() { this.el.hide(); }

Sometimes, when the callbacks are short, it's easier to use anonymous functions :

states: {
    visible: {
        enter: [function() { this.el.show(); }], 
        leave: [function() { this.el.hide(); }]
    },
}

This should be easy, but your _collectMethods prevent the use of anonymous functions. You can define anonymous function as callbacks in Vanilla Backbone events hash.

[sebpiq]

Merged!