Updating the dev environment guide for the Sahara UI
Updating the dev environment guide for the Sahara UI

Updates related to the move to /contrib which happened
during the L cycle.

Change-Id: I564241ea20b5ef966a4e7458a7c62f6457abb081
Partial-Bug: #1490687

crobby/sahara,openstack/sahara,openstack/sahara,zhangjunli177/sahara,tellesnobrega/sahara,zhangjunli177/sahara,zhangjunli177/sahara,tellesnobrega/sahara,egafford/sahara,crobby/sahara,egafford/sahara,crobby/sahara