BemDomEntity. Static method for init entity on dom (v4-5)

[belozer]

static method: findOn

findOn(node: BemDomEntity|Element|NodeList|HTMLCollection): ?BemDomEntity

example
Link.findOn(domNodes);
Link.findOn(this._elem('link'));

current
bemDom.getEntity(domNodes, Link);
this._elem('link').findMixedBlock(Link);

From history v3 and old versions
this.findBlockOn('link', 'link');

@veged @tadatuta

upd
Example with _events

this._events(Button);
this._events(Button.findOn(this._elem('add-address')));

vs
this._events(Button);
this._events(this._elem('add-address').findMixedBlock(Button));