Include String.prototype.repeat shim

[daurnimator]

Solves #182

[alexei]

A custom String repeat implementation was shipped up until #139 It's not going back into the library. Sorry!

[aikar]

With this being so tiny and not polluting String, what does it hurt to maintain it?
Don't get me wrong, I want IE to go away as much as anyone else, but for a simple project that wanted to support IE11, not being able to use this library without polyfills is a major setback.

[aikar]

#182 (comment) is also a great point.

Library authors are now no longer able to use this library if they support IE11.

[aikar]

That removal should of also been a SEMVER MAJOR break.

[ashwalk33r]

Instead of .repeat other means of achieving desired output can be used that are supported in IE11 - I see people prefer to do it like in fengari-lua/fengari@8cbc96e

In other hand String.repeat maybe a nice helper tool.

@alexei in #183 (comment) do you mean that
.repeat was introduced over custom String decorator? Do I take it as no for polyfills and no for decorators?

[ashwalk33r]

@daurnimator I don't get something - you create a custom function assigned to variable encapsulated properly and call it repeat.call(pad_character, pad_length) - what is this discussion with @alexei about? I agree with #183 (comment)

It's not a "function to mantain" - it is a reusable helper. @alexei do you want to have it used inline instead of being repeatable? What is "not requiring maintanance" solution that you wish for? Here you have it then #192

[ashwalk33r]

Hey I've took my own spin on this matter #193