add test suite
PATH completed, execv works
add job control, still has bug running vim in background
adding background
function bg ok
one bg work, multi bg doesnt work
remove
finish bg
checkjob() works well
implement cd
implement pipeline
modifying bad file descriptor
fix sleep signal
fix bug, come to test case
Merge pull request #2 from kklt92/devN

Finish most of the function.
Merge pull request #3 from kklt92/develop

finish most of function