(#17) replace and update publishers now return a promise.
Merge branch 'feature/17-let-resource-publishers-return-promise'
Changelog for release v0.13.0
prepared artifact for upcoming release 0.14.0
(#18) visibility: add a handler to work with visibility events
(#18) Cleanup, spec-tests for visibility handler
(#18) visibility handler: changelog
Merge branch 'feature/18-visibility-handler--rebase'

* feature/18-visibility-handler--rebase:
  (#18) visibility handler: changelog
  (#18) Cleanup, spec-tests for visibility handler
  (#18) visibility: add a handler to work with visibility events
(#19) fix phantomjs installation
Merge branch 'feature/19-fix-phantomjs-installation'

* feature/19-fix-phantomjs-installation:
  (#19) fix phantomjs installation