Drop IE <=10 support and extend new JavaScript features about catberry HOT 6 CLOSED

We have to come up with a list of Babel transformations according to the Node.js server-side JavaScript grammar.
It includes full ES6 support for versions >= 6.5 and >=7.6.
Also, partial support for ES2016.

Another useful list (w/o harmony flag)
http://node.green/

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We also can use https://github.com/babel/babel-preset-env and dynamically decide what to support.

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We're in a weird situation: we can't allow to use any preset because it would break the minification which is currently done by Uglify (because it does not support ES6). But we still can't use Babili because it's in beta.

So, we have to either use Babili and ignore its beta state or keep the current preset by default which can't be overwritten by .babelrc currently.

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IE11 usage is still 3.1% — https://www.w3schools.com/Browsers/browsers_explorer.asp
IE11 es6 support is only 11% — https://kangax.github.io/compat-table/es6

It seems that babel-preset-env doesn't give any significant advantages today. But it's a little bit risky to use babili beta version.

I think, we have to wait one of this:

• stable babili release
• uglify harmony release
• ie11 usage will drop at least to 1%

As it doesn't look like a breaking changes, we can use babel-preset-env later.

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@kalyanov at least we can use the standard Babel preset by default and ignore IE <= 10. It won't break anything except the support of these browsers.

We can switch to Babili later without breaking changes, I presume.

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Oh, yes. IE 10 is dead :)

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