Add 'kpod images' and 'kpod rmi' commands

'kpod images' lists all images on a system.  'kpod rmi' removes
one or more images from a system.  The images will not be removed
if they are associated with a running container, unless the -f
option is used

Signed-off-by: Ryan Cole <rcyoalne@gmail.com>

docs/kpod-rmi.1.md

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+## kpod-rmi "1" "March 2017" "kpod"
+
+## NAME
+kpod rmi - Removes one or more images.
+
+## SYNOPSIS
+**kpod** **rmi** **imageID [...]**
+
+## DESCRIPTION
+Removes one or more locally stored images.
+
+## OPTIONS
+
+**--force, -f**
+
+Executing this command will stop all containers that are using the image and remove them from the system
+
+## EXAMPLE
+
+kpod rmi imageID
+
+kpod rmi --force imageID
+
+kpod rmi imageID1 imageID2 imageID3
+
+## SEE ALSO
+kpod(1)