Update README with more specific install/config instructions
Update README with more specific install/config instructions

This should make installation easier for more casual users.

Also some misc. formatting improvements.

Change-Id: Ifcc9ef9c982ce531787635bb7206b93565998460

thanhtien522/nova-docker,AlphaStaxLLC/nova-docker,thanhtien522/nova-docker,Juniper/nova-docker,MinmingQian/nova-docker,stackforge/nova-docker,harnesscloud/nova-docker,cloudbase/nova-docker,msrba/nova-docker,MinmingQian/nova-docker,godvmxi/nova-docker,devdattakulkarni/nova-docker-1,gwdg/nova-docker,ggiamarchi/nova-docker,AlphaStaxLLC/nova-docker,mangalaman93/nova-docker,godvmxi/nova-docker,msrba/nova-docker,Ye-Yong-Chi/nova-docker,harnesscloud/nova-docker,gwdg/nova-docker,ggiamarchi/nova-docker,Juniper/nova-docker,stackforge/nova-docker,mangalaman93/nova-docker,Ye-Yong-Chi/nova-docker,cloudbase/nova-docker,devdattakulkarni/nova-docker-1