Proposes some updates to JS lessons 1 and 2.

These are some changes I think would be good for JavaScript lessons 1 and 2. I'd like them to initiate a discussion, and hopefully evolve a bit in the process. :)
Perhaps we should adjust these existing but moved phrases (old line 130, new line 197) - "loop does not need to be based on a counter" and "... without using counters". We've added "x = x + 1" to the while loop below (revised line 209), so we now have a counter.