Generate keys after account creation.

[vqhuy]

• Part of Async key generation #20

[arlolra]

ui.generate() is going to open a blocking modal, which is what we want to avoid.

Instead, you should directly call,

otr.generatePrivateKey(acc.normalizedName, acc.protocol.normalizedName)

which will launch the async worker.

We'll want to suppress any error here though. So,

otr.generatePrivateKey( ... ).catch(function(err) {
  Cu.reportError(err);
});

[arlolra]

Great, thanks!

Merged in 67ffdb8