declareAcquiredMethod generated function should not call local (ie, same
gadget) allowedAcquisition method.

Use declareAcquiredMethod instead.

aq_dynamic was a "low level" method, somehow hard to understand.
Allow acquisition more explicitely by providing the method name allowed.

Replace the gadget method "acquire" by the Klass function
"declareAcquiredMethod" which generates new accessors on this class and do a
direct mapping with the parent aq_dynamic function.

Acquisition will be the only way to propagate informations to the parent
gadget.

It may help developper to see all properties which are not part of the API.

Add methods to fetch an existing gadget from its scope and drop the scope
reference.

Thanks to Thibaut Frain for this patch.

Display the error in the console.

The method .on, .off, .trigger have been added.
See RSVP.EventTarget.mixin for full details.

Propagate the events in case of EmbeddedGadget to the parent IframeGadget.

As renderJS is not compatible with phantomJS (which does not support CSS
loading events), no need to slow down default execution.

Drop jQuery usage in test.

Replace jQuery by RSVP.
Allow to declareGadget without attaching it to the DOM.
Correctly handle error.

IFrame are currently broken.

Thanks to Caleb James DeLisle.

A better fix in this case would be to cleanly allow RenderJS gadget
instanciation to wait for some events (require and any other JS code)
before deciding that a gadget is ready. Currently, RenderJS ready
function is triggered when all JS scripts defined in the HTML page are
loaded. One idea would be to extend the API to allow the gadget to
explicitely trigger the ready callback (but it will block the full
system if one gadget failed to load).

Thanks to Caleb James DeLisle.