Import / export mockups JSON, fixes #11
Removes old function call.
This function was removed in commit 468192b2620190aa868ace198d0fb7cb28bfb8dd, but not all refs to it were removed.
Merge pull request #13 from AndreMiras/feature/ticket11_import_export_mockups_json

Import / export mockups JSON, fixes #11
Merge pull request #14 from AndreMiras/feature/fix_object_has_no_method_toggle_navigation

Removes old function call.