GitLab

minor unitest fixes

In pithos download/upload ctrl-c is caught when multithreading,
and wait for active threads to finish before exiting

gevent depedency is not needed after that

cat prints a remote file to console
this used to be achieved by calling download with only one
parameter, which is not supported anymore

Conflicts:
	kamaki/__init__.py
	kamaki/cli.py
	kamaki/clients/__init__.py
	kamaki/clients/astakos.py
	kamaki/clients/compute.py
	kamaki/clients/cyclades.py
	kamaki/clients/image.py
	kamaki/clients/pithos.py
	kamaki/clients/storage.py
	kamaki/config.py
	kamaki/utils.py
	setup.py

Actually, setuptools don't support "optional", so they are
just not installed

There are some issues:
- in Pithos: big-file handling, binnary file up/download
- in Cyclades: some methods need extra access to be tested
- in Image: remove_members, list_shared not checked properly

Connection module errors are controled and nicer
untitest list_public