Nearly drop iframe timeout.
Add reportGadgetDeclarationError acquired method.

Performance improvements.

* add an internal gadget state
* rename __element property to element
* add declareJob function
* add onEvent method
* 'this' in ready is now the gadget instance InlineSide-by-side

Improve error verbosity

Do not prevent calling declareGadget in ready functions.
Allow to directly declareGadget inside the HTML.

Drop EventTarget support on Gadget.
Add declareAcquiredMethod, allowPublicAcquisition.
Prefix attribute non part of the API by __. Such method/property can be rename
in next versions without any compatibility support.
Use base element in iframe to get the same link behaviour with or without
iframe.

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.

Drop jQuery usage in test.