DEL doesn't remove scene elements
Added setter for tags (in a simple textfield in scene editor)
Merge pull request #123 from anserran/edittags

Added (very) simple edition of tags in scene editor
Header updates
Merge branch 'master' of github.com:e-ucm/ead
Rename Actions to ActionsManager
Rename Views to ViewsManager
Creatring a constant for the preferences file default name.
Improving javadoc