Extend RouteGadget API to test multiple routers per page.

and traverse to parent gadget. This allos multiple gadget instances in
one page.

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.

additional server side encoding.

gadgets that are connected (i.e. change on one affects other through
exposed gadget API).

Clean up.

generate easily. Clean up all created from make process.

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

unexpected failures.

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.