Made user cache non-default
Made user cache non-default

Reduces dependencies and thus the potential for bugs:
- No `/var/cache/xcauth` needed with the right permissions
- No dependency on `python-bcrypt` package

jsxc/xmpp-cloud-auth,jsxc/xmpp-cloud-auth,jsxc/xmpp-cloud-auth,jsxc/xmpp-cloud-auth