Adds while and for loops.

I've included examples in the example.djs file.

'many' translates into a while loop whilst 'much' translates into a for loop.
Sections within the for loop definition are shown by 'next'
For includes, by necessity, +=, -=, *=, and /= as more, less, lots, and few respectively. I'm not happy with the term few but it's the best I could come up with that fit.