Merge pull request #33 from gsr-shanks/dev

Update README with manual execution steps
Merge pull request #34 from gsr-shanks/dev

Change /home/nexus to /home/user to avoid confusion
Merge pull request #35 from gsr-shanks/dev

Copy idm_ci.py to nexus.py to make it general.
Add comments to functions

Signed-off-by: Gowrishankar Rajaiyan <gsr@redhat.com>