Adding API doc for get image member of Glance v2

Fixes bug 1214725

Change-Id: Ic817ed3c577d60cfb3789d379bfbef6fe1f15c1e
Remove extra www/api-ref-guides.html

This file is not referenced anywhere AFAIK, it gets published at
http://api.openstack.org/api-ref-guides.html

We do have in openstack-manuals a similar file that is referenced:
http://docs.openstack.org/api/api-ref-guides.html

Remove this extra version.

Change-Id: I2286bbfe2645ca84df928a8adebed7851a179ed4
Merge "Adding API doc for get image member of Glance v2"