Removed obsolete features due to new autostart feature

- Removed dependencies from licy.plugin
- Removed licy.require
- Removed licy.each
- Removed licy.status
Improved examples
Simplified implementation
Added licy.plugins

Allows to register multiple plugins at once. Especially useful to define
plugins as separate modules and then register them all in one file:

licy.plugins({
  foo : require('./foo'),
  // ...
});