clean up import of ApiException

Signed-off-by: Tim Henigan <tim.henigan@gmail.com>
eliminate warning about unused variable

'numeric_score' was assigned simply to verify that the value provided by
the user is actually a numeric value.  Rather than create a new, unused
variable, we can simply reuse the existing var.

Signed-off-by: Tim Henigan <tim.henigan@gmail.com>
create simple form for adding game servers

Users with the 'ratings_admin' role may now add game servers to database.
Upon creation, a token is generated and assigned to the server.

Signed-off-by: Tim Henigan <tim.henigan@gmail.com>
add and API endpoint to list all registered game servers

Only admins on the AGA ratings server have access to this API.

Signed-off-by: Tim Henigan <tim.henigan@gmail.com>