Restore Ractive.debug and options to init method

`Ractive.debug` ok in lieu of `Ractive.defaults.debug`

init options updated to actual values:
```js
var Component = Ractive.extend({
	init: function ( options ) {
		t.equal( options.foo, 'bar' );
		t.ok( options.magic );
	}
});

var ractive = new Component({
	el: fixture,
	foo: 'bar',
	magic: true
});
```