EUCA-3933 - euca-modify-image-attribute allows invalid userId without
error.

This is updated for the reworked fix.
EUCA-1057 second euca-deregister does not deregister the image
completely.
EUCA-2366 Unclear error message when attempting to create a volume
larger than permitted.
EUCA-4268 RebootInstances does not work on multiple instances
Merge pull request #116 from mmunn1/testing

 EUCA-3933 - euca-modify-image-attribute allows invalid userId without