Added parent component
Create parent hierarchy after loading
Updated those actions that require to set a parent and related tests
Some refactor in ContextMenu
Skin updated
Some refactor in LinearLayout
ContextMenu test
Cleaned up eAdventure Mockup skin.
Parent component is ignored in saving
Updated javadoc in Parent component
Added title to the edition windows.
Fixed a bug with the MenuButton width in some cases.
Merge pull request #483 from anserran/parentcomponent

Parent component
Refactor in Model listeners. Model listeners must be in lists
Some changes to fire less unnecessary selection events
SceneEditor listens to selection changes
Merge branch 'master' of github.com:e-ucm/ead into sceneeditorselection
Merge pull request #485 from RotaruDan/someFixes

More eAdventure Mockup fixes.
Fix in ContextMenu
Merge pull request #484 from anserran/contextmenues

ContextMenu refactored