Use a wrapper around Persona to remove its session state, which leaves just the server-side session state
SPA: do not ask the nick for every Server methods
SPA: get closer to the documented SPA interface
Worker: fix tests
Fix jshint error
Address review comments
Merge with master
Merge pull request #257 from Standard8/persona_fix

Use a wrapper around Persona to remove its session state
Merge branch 'master' into spa-call-interface
Merge pull request #260 from tOkeshu/spa-call-interface

Spa call interface