Release 2.0-rc3

Thanks @BenDol and other contributors

• Fixed issues #167
• MaterialComboBox
  • Added method closeOnSelect(boolean value)
  • Improve the multiple option to display it as checkbox option
  • Fixed #154
• MaterialTree
  • added method deselectSelectedItem()
• Supports Path Animator to be instantiated
• Supports Scrollfire to be instantiated
• Fixed - Autocomplete - Clear() does not remove active stylename on Placeholder
• Fixed - configuration property named 'CssResource.legacy' warning
• Major improvements to MaterialDnd & MaterialWindow.
• Remove the DndHelper.
• MaterialWindow
  • Make MaterialWindow padding apply to the content panel.
  • Fix the MaterialWindow open animation.
  • More fixes to MaterialWindow events.
  • Resolve window overlays, now using static overlay.
  • Fix window content add/remove operations.
• Subheader
  • Fixed issue on new header actually scrolls up past the current header