Added .gitignore.
Replaced previous xmlrpc session validation with a new decorator.

The previous session validation was seriously broken. The new
decorator passes in a session instance as the first argument
to each method.
Updated xmlrpc session validation for siptrackd.py
Updated xmlrpc session validation for attribute.py
Updated xmlrpc session validation for baserpc.py
Updated xmlrpc session validation for config.py
Updated xmlrpc session validation for container.py
Updated xmlrpc session validation for counter.py
Updated xmlrpc session validation for device.py
Updated xmlrpc session validation for event.py
Updated xmlrpc session validation for network.py
Updated xmlrpc session validation for password.py
Updated xmlrpc session validation for permission.py
Updated xmlrpc session validation for simple.py
Updated xmlrpc session validation for template.py
Updated xmlrpc session validation for user.py
Updated xmlrpc session validation for view.py