Merge pull request #8 from Omar-Hossam/ok

Ok
 I can't really remeber
Merge pull request #9 from Omar-Hossam/ok

fixed shift method
 fixed and added lb and lbu
 fixed ALU
Merge pull request #10 from Omar-Hossam/mohamed

Zeby
mc
 fixed mewWrite and memRead, deleted instruction with wromg opcode, added lui
Merge pull request #11 from Omar-Hossam/mohamed

 fixed mewWrite and memRead, deleted instruction with wromg opcode, adde...
implementing bne and lhu
mc
Merge pull request #12 from Omar-Hossam/2lOH

2l oh
Added slt