Fixed compatibility issues with vaadin gradle plugin 0.8
Enabled superdevmode
Ensure empasis does not leak to surrounding layouts
Applied proper formatting to code
Fixes toggling drag&drop state properties #14
Refactored out common drop handler code into abstract class
Removed unnessesary override
Refactored drophandler update to helper method
Removed unnessecary inheritDoc from connectors
Updated Copyright year
Mass reformatted demo source code