Details on enabling Anti-Affinity

Partially implements blueprint docs-for-v02

Change-Id: I1cbfb89664abfd8886e4d10f2b5c6eeb5ddfa458
Some more last-minute changes to docs

 * Removed doc for REST v0.2
 * Added details on how to register an image
 * Added page listing available plugins

Partially implements blueprint docs-for-v02

Change-Id: I1c84258bb7260fe5234f789bb538aca7cec2a22c