Can't claim claim-codes

[SueSmith]

Re #20 - Logging here as the claim endpoint in the API seems to work. When I call claimClaimCode my app hangs, with no response. The claimed field updates in the db but doesn't add any included email.

Using e.g. this:

var context = {
    system: 'badgekit',
    badge: '<slug>',
    claimCode: '<code>',
    email: 'clever@clogs.com'
};
client.claimClaimCode(context, function (err, returnedData) {
//...

Apologies if I've missed something daft!