ViewHistory to store view updates
Added back/next view operation to Views, with ViewCommand
Change View.NAME for View.class, adapting views to new API Also, in MockupViews, interchange intialize for getView, since their meaning changed: Now, initialize is called first, and then getView.
Path in filelistwidget now is at the top
Added back and next actions to buttons in MainToolbar
Created EditorWindow as main container of the application
Added empty perspectives
Fix AndroidViews onBackPressed
Added equals to ViewUpdate
Merge pull request #504 from anserran/viewscontrol

Added ViewHistory (back and next buttons) and Editor main window