Support different javascript modules

[makishvili]

Chitalks.js is available as YModules only.

It would be great if it supports others modules. I saw realization of this idea at Dmitriy Filatov products. For example:

• JSPath https://github.com/dfilatov/jspath/blob/master/lib/jspath.js#L1320-L1335
• Inherit https://github.com/dfilatov/inherit/blob/master/lib/inherit.js#L171-L191

This will help solve another issue #32