Fix typo in server_create
Support more console types in get_server_console

Refs #36

New types: vnc-ws, vnc-wss
Support more console types in "server console" cmd

Refs #36

New types: vnc-ws, vnc-wss
Translate no-vnc console types from CLI to API

Fixes #36

The terms "no-vnc" and "no-vnc-encrypted" are expected to be easily
understood by users, while the equivalent terms vnc-ws and vnc-wss
(respectively) are used in Compute API. Kamaki CLI will now
accept both terms by internally translating the former to the later.
Report error in case of incorrectly encoded terms

Fixes #41

This bug was located at the code that parses the command terms.
If a term is invalid with respect to the current locale settings,
an "Unknown error" was being raised.
Kamaki is now reporting a descriptive error with a reference to
the faulty term.