0.2.0

• -Implemented dialogs for creating new material and post filter view file.
• -Implemented dialog of graphic settings.
• -Updated the sky in material editor.
• -Upgraded jME3 libraries to 3.1 alpha 2 with PBR.
• -Implemented preview of images in resource selector.
• -Migrated editor to jME 3.1 with PBR.
• -Added support PBR to Material Editor.
• -Finished implementation PostFilterViewer.
• -Implemented the base actions in AssetTree.
• -Implemented MaterialEditor.
• -Added English localization.