Added in more stuff! ...and bug fixes

Added in mod, cleaned up code, added in implicit multiplication with
brackets, and general bug fixes (as well as spelling fixes)

next build: implicit multiplication with functions
Bug fixes and implicit multiplication

Some bug fixes, implicit multiplication.
Possibly a bit slow now. I should try to benchmark this and speed up
areas that are slow.

I benchmarked the last commit and I was getting an average of 24ns per
query on my machine. Now it's up to about 30ns.

Anyways, next commit: readme fixes, new examples, cleaning up code, and
merging beta with head.