render gadget immediately.

so they don't become orphans.
TabbulkarGadget keeps track of most recent gadget being used and cleans
it up when new one is added, thus reducing trash in Gadgetindex and DOM.

existing Gadget methods.

call them from gadgets without taking care for real implementation
inside. Allow force rebind for InteractionGadget.
Extend test for mentioned changes.

Allow getSelfGadget to be used in handler function.
Allow to define multiple levels of urls.

between different applications.

Pass gadget_id to route handler function so it can pick up gadget
instance easily.
Extend test.

executable function from RouteGadget.
Extend tests to follow change above. Add InteractionGadget to show how
RouteGadget works with InteractionGadget in example.

Add example for routes and gadgets.

Clean up.

version.
Add Makefile which is able to produce a minified version.

Add needed basic jio libraries and adjust test accordingly.

- multiple gadget repositories
- multiple gadgets per repository
- API to select proper gadget based on what it provides.