Further tweaks for famiclom.
A better way.
Too tired. Stop hacking.
Macro-ify BRANCH-IF. Undo EXECUTE change that broke tests.
Macro-ify SET-FLAGS-IF.
Add NMI support.
Pass CPU explicitly for famiclom.
Update tests for new cpu passing.
Whoops. Export NMI.
Fix carry bit handling in the compare opcodes.
Stop double jumping in JSR. Doh!
Merge pull request #4 from redline6561/dev

Bugfixes, Cleanups, and NMI for Famiclom