Used BH only to build sets

Resolved #1148 

1. Для сборки html на сервере теперь используется `?.bh.js` вместо `?.bemhtml.js`.
2. Для клиентского JavaScript используется `?.browser.bh.js` вместо `?.browser.bemhtml.js`.
if we agreed that `BH` should mimic to `BEMHTML` can't we use the same tech for both engines to create HTML?
the rest looks good looks good for me so if it's hard to implement with `ENB` — squash commits!