Simplify API: custom naming convention

[blond]

Now we need use BEMNaming class to create instance.

var BEMNaming = bemNaming.BEMNaming;
var myNaming = new BEMNaming({ elem: '__', mod: '--' }); 

myNaming.parse('block__elem--mod');

The bemNaming can be function that returns a BEMNaming instance.

var myNaming = bemNaming({ elem: '__', mod: '--' });

myNaming.parse('block__elem--mod');