Big rewrite of the the hosts module.
Removed commented code.
Using sets instead of tuples in Hosts definition.
Updated docs: using sets instead of tuples for hosts in host definition.
Simple SCP shell added.
fixed import.
Progress bar for connecting to SSH improved.
Removed dead code + added comments.
Renamed HostsContainer.get/put to get_file/put_file for consistency.
More tests for has_command (in case of unknown command.)
Splitted hosts/__init__.py in {base/ssh/local}.py
Moved paramiko_connect.py
Removed commented code.
Added deprecation notice.
Cleanup in HostContainer.
Host.stat cleanup.
get_file/put_file tests for host_container.
Stat test.
Used 'as' keyword for exceptions.
unit tests for query exception.