Problem 8: That was another really fun one

Take a look at #each_consecutive_chunk_of. It takes an enumerable and
yields each consecutive chunk of N items.

For instance, '123456'.each_consecutive_chunk_of(3) would yield:

* 123
* 234
* 345
* 456
This one required some algebra ... Yeesh

Had to have a hint for that.
Problem #10: More primes. Thank you so much ruby-core!
Problem #11: I'm sure there's a better way to do this

This one, for whatever reason didn't cooperate. The solution, however, worked. I'd like to come back to this at some point and add some more tests that cover the problems I ran into.