Improve REAMDE file
Improve REAMDE file

updated freezer-api urls
updated dependencies for deploying freezer-web-ui
added information about proxies

Change-Id: I50392b2674f4762016d7223051f6f23d15ba45d6

openstack/freezer-web-ui,openstack/freezer-web-ui,openstack/freezer-web-ui,openstack/freezer-web-ui