Introduce ES6 Array.prototype.find and Array.prototype.findIndex to poly
Assert find calls calls the predicate once for each element present in the array, in ascending order, until predicate returns true and immediately returns the current array element.
Extract all the shared code into a new library file.
Tidy up the code appearance.
Merge remote-tracking branch 'upstream/dev' into dev
Merge pull request #20 from jaredcacurak/dev

Introduce ES6 Array.prototype.find and Array.prototype.findIndex to poly