Added sample and random tests to javascript.

The issue about random tests was still open, so, why opening another one? I had to replace the original solution once I've added random tests (but both solutions worked with the fixed test), so try again.

There are still no random tests for Java Script.
I tried to submit my solution, but it was rejected.
Even though it works well in Chrome...
I used RegEx to select words from the string before further manipulations.
Could you please notify, how this issue can be solved?