Updating README for 1.13.0 release
Updating README for 1.13.0 release

Change-Id: Icf8d46f4fd7db9cf9041ea76a40401568b8b2d0c

rackerlabs/rackspace-docs-maven-plugin,stackforge/clouddocs-maven-plugin,rackerlabs/rackspace-docs-maven-plugin,OCselected/clouddocs-maven-plugin,stackforge/clouddocs-maven-plugin,rackerlabs/rackspace-docs-maven-plugin,OCselected/clouddocs-maven-plugin,rackerlabs/rackspace-docs-maven-plugin,rackerlabs/clouddocs-maven-plugin,rackerlabs/clouddocs-maven-plugin,rackerlabs/clouddocs-maven-plugin,inocybe/sdndocs-maven-plugin,inocybe/sdndocs-maven-plugin,OCselected/clouddocs-maven-plugin,inocybe/sdndocs-maven-plugin,stackforge/clouddocs-maven-plugin,stackforge/clouddocs-maven-plugin,OCselected/clouddocs-maven-plugin