Merge pull request #5 from mllewellyn/rtype_alu_tests

fixed errors in shifts, haven't tried shifting with sign bit yet, also n...
Merge pull request #6 from mllewellyn/rtype_alu_tests

Rtype alu tests
Merge pull request #7 from mllewellyn/rtype_alu_tests

Rtype alu tests
fixed typo
Merge pull request #8 from mllewellyn/mul_div_debugging

fixed typo