Cleanup Configuration for Examples/Tests

[obuchtala]

The examples and test-suite will be run in node.js in first place.
However we need a way to test the JSC emitter, too.

We have a custom javascript shell in /Tools/javascript which should be reduced to a minimum and put into the Examples folder to be shared by tests and examples.
Then we need adaptations to Makefile.in etc. to be able to switch to the JSC interpreter
if desired.

Note: Due to the node.js runner we also need to add a minimal 'require' built-in for the JSC based interpreter.
IMO, we can drop the v8 interpreter, as the v8 emitter is tested with the node.js based tests.

[obuchtala]

I think it is acceptable now.
In future I could try to get rid of the special handling for nodejs tests and use the native compilation
instead of node-gyp.

[obuchtala]

Naa. The configuration for Examples needs to be assimilated to that of the test-suite.