word-count: use 'constructor' as a reserved word
word-count: use 'constructor' as a reserved word

As 'prototype' isn't a standard property on an object's prototype,
the test didn't actually check the case of dealing with a collision

The 'constructor' property is a standard

see: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object
and: http://www.ecma-international.org/ecma-262/5.1/#sec-15.2.4

marcCanipel/xjavascript,marcCanipel/xjavascript,cloudleo/xjavascript,exercism/xjavascript,cloudleo/xjavascript,exercism/xjavascript