Major refactor with an eye on v1.0.

The goal of the refactor is to make namespaces and actions more intuitive to
use. Once declared, namespaces can be accessed directly as properties of
virgilio. Actions can be invoked like functions.

A second goal was to reduce to complexity of Virgilio (even further). The
mediator was considered superfluous and removed, taking with it timeouts, pubsub
and, for now, forking. `execute()` is gone too, as there is no use for it
anymore.

Before joining these changes back to master, some examples/tests might need to
be rewritten to better display the new way of working (though the current
examples/tests work fine).

Also, a backwards-compatibility module should be written to add the features
that dissapeared back in for projects that depend on them.
Merge branch 'develop'
Updated dependencies.
Made virgilio an eventEmitter.
Removed Virgilio's non-$-ed methods.

Because namespaces are now set directly on top of Virgilio, it makes sense to
clean up the amount of properties Virgilio has.

From now on, one should always use the dollarsigned methods.
Started rewriting examples.
Added gulp task for converting examples to tests.
Examples now run as tests.

Because the mocha grunt plugin only takes file paths, it is necessary to save
the interpreted examples and run the tests on those saved examples. Examples
will be built into the example-tests directory.
`gulp test` now runs example and unit tests.
Added example-test for logging.
Added shortcut for recursive action calling.

In an action, call `this.$execute(...args...)` for a recursive call.
Getting function name in a more sensible way.
Added example-test for errors.
Added examples on modules and configuration.
Removed old example-tests.
Renamed example file name.
Made virgilio.extend$ more intuitive to use.

Added an example for using it too.
Fixed a bug with `virgilio.extend$`.

The bug prevented `virgilio.execute$` to be used for registering new methods.
Put gulp-example-to-test in a seperate library.
Fixed gulp docs task.