Added delegate/undelegate fallbacks to bind/unbind and fixed broken Zepto/Dojo delegate implementations

[andykant]

can.delegate and can.undelegate (in util/LIBRARY/LIBRARY.js) don't implement fallback binding for objects for non-elements and objects that don't explicitly define delegate/undelegate. (#754)

This is an updated pull request based on the minor branch instead of master. (see #758 for the original pull request)

Additionally, the existing Zepto/Dojo delegate methods completely fail in cases where the selector === "".

This pull request fixes these issues by having can.delegate/undelegate fallback to their can.bind/unbind counterparts in cases where normal object instances don't implement delegate/undelegate. Also included is the addition of can/util/event and can/control/modifier tests to the tests run with all libraries in test/* as well as adding test/jquery-2.html to test/index.html.

For example in util/jquery/jquery.js:

delegate: function(selector, ev , cb){
    if(this.delegate) {
        this.delegate(selector, ev , cb)
    }
     else if(isBindableElement(this)) {
        $(this).delegate(selector, ev, cb)
    } else {
        // make it bind-able ...
    }
    return this;
},
undelegate: function(selector, ev , cb){
    if(this.undelegate) {
        this.undelegate(selector, ev , cb)
    }
     else if(isBindableElement(this)) {
        $(this).undelegate(selector, ev, cb)
    } else {
        // make it bind-able ...

    }
    return this;
},

The problem with this is there are portions of the CanJS codebase that call .delegate instead of .bind. Specifically, modifier functions like in can/control/modifier.

steal("can/construct", "can/control", "can/control/modifier", function(Construct, Control) {
    Construct("SomeObject", {
        bind: can.bind,
        unbind: can.unbind,
        dispatch: can.dispatch
    });

    Control('SomeClass', {
        init: function() {
            this.options.some_object = new SomeObject();
            this.on();
        },
        "{some_object} some_event:debounce(100)": function() {
            // THIS NEVER FIRES
        }
    });

    var control = new SomeClass(document.body);
    control.options.some_object.dispatch("some_event");
});

[andykant]

Closing, as these changes are now included in #870.