add sub and
Merge pull request #12 from bdrumheller/working

add, sub, or
Merge pull request #13 from tassiahmed/working

Working
Moved implementation of add and sub to addu and subu since they were the actual implemantations for those instructions.
Also added the func code for SUBU into sim.h
Merge pull request #14 from tassiahmed/working

Moved implementation of add and sub to addu and subu since they were the...
Added implementations for add and sub that check for overflow and break if overflow is detected
Merge pull request #15 from tassiahmed/working

Added implementations for add and sub that check for overflow and break ...