completes chapter 6

Signed-off-by: Alexander Skjolden <alex@plastboks.net>
deleted accidental vim tmp file

Signed-off-by: Alexander Skjolden <alex@plastboks.net>
added eval function, and some base arithmetic functions

Signed-off-by: Alexander Skjolden <alex@plastboks.net>
added more arithmetic and min max functions

Signed-off-by: Alexander Skjolden <alex@plastboks.net>
Merge branch 'master' of github.com:plastboks/byol

Conflicts:
	.gitignore