Updated skin
Updated log level in EditorUI
Show context menu method added to view
Added action to show context menues
Updated perspective buttons with scenes list
Some strings
Fix layout of tab widget and tabs panel
SceneEditor must listen to changes in added elements
Created SceneRibbon and InsertTab
Updated tests
Some constants
Translations
Merge pull request #498 from anserran/sceneslist

Added scenes list to perspective buttons
Merge pull request #499 from anserran/tabs

Added SceneEditor tabs (ribbon).