Refactor a function 'editor.api.start'.
Just work!
Refactor to merge controler.userEvent.viewHandler.setViewModeXxx to controler.userEvent.viewHandler.setViewMode.
Disable push buttons 'replicate-auto' and 'relation-edit-mode' at view-only-mode.
Ignore events from an unselected editor.
Remove an unnecessary event bindig.
Refactor view.viewModel.modeAccordingToButton.
Merge pull request #60 from pubannotation/view_mode

Add view only mode.