Seems to help by a couple percent.

Closes #211

staticmethods and classmethods

Dict methods

Good for a 10-15% speedup

I still feel like we can do much better here though

(Committed by kmod)
Closes #93

Make check_format actually useful

Add sudo for zsh installation

Property

Some small changes to simplify the generated IR.

Also make a note that the CPython development headers are necessary
for running the tests.

Fix typo in IOError format string