Imitate BEMHTML export behaviour

[Vladimir Grinenko]

Now we have require('bundle.bh.js').apply() but requre('bundle.bemhtml.js').BEMHTML.apply().

I suggest to add mimic option as an array of names to additional export.

[Sergey Belov]

@tadatuta What do you mean?

[Vladimir Grinenko]

@arikon added description

[Sergey Belov]

@tadatuta 👍