SPA: do not ask the nick for every Server methods
SPA: get closer to the documented SPA interface
Worker: fix tests
Fix jshint error
Merge branch 'master' into spa-call-interface
Merge pull request #260 from tOkeshu/spa-call-interface

Spa call interface
worker: removed contactsDb global
Merge pull request #262 from n1k0/remove-contactsdb-global

Worker: remove the contactsDb global
worker: introduced new CurrentUsers object
moved TkWorker#updateContactsList logic to CurrentUsers#updateContacts
addressed review comments
early return statements == no need for else statement
Merge pull request #261 from n1k0/worker-current-users-object

Worker CurrentUsers object