(#56) object: removed all direct calls of hasOwnProperty.
Merge branch 'feature/56-remove-direct-hasOwnProperty-calls'
(#57) fixed double-navigation problem which can lead to skipping places
Merge branch 'feature/57-prevent-double-navigation'

* feature/57-prevent-double-navigation:
  (#57) fixed double-navigation problem which can lead to skipping places
(#58) portal, json: fixed copyright headers
Merge branch 'feature/58-fix-copyright-headers'

* feature/58-fix-copyright-headers:
  (#58) portal, json: fixed copyright headers
(#58) portal, json: fixed copyright headers: changelog
Merge branch 'feature/58-fix-copyright-headers'

* feature/58-fix-copyright-headers:
  (#58) portal, json: fixed copyright headers: changelog
(#59) portal: fixed dangling comma in timer imports
Merge branch 'feature/59-fix-timer-dangling-comma'

* feature/59-fix-timer-dangling-comma:
  (#59) portal: fixed dangling comma in timer imports