install.py: Add package module-assistant
install.py: Satisfy coding style of PEP8
.zshrc: Keep ubuntu-ygu5-01 same config with 02
Add clean support

--clean is useful to reset to a clean repo. It is very dangerous that
could reset the local changes.
Merge pull request #5 from halton/master

Add clean support
Add new patch https://aia-review.intel.com/#/c/3357/

And fix a typo for PR #5.