Updated linux stylesheet

Default linux style uses now the provided SVG buttons for the floating widget title bar close button

Added documentation for FocusHighlighting flag

Try to fix appveyour build problem

Merge branch 'master' of https://github.com/githubuser0xFFFF/Qt-Advan…

…ced-Docking-System

Added showcase section to README.md

Removed dead code in comment of DockAreaWidget

Merge branch 'master' of https://github.com/githubuser0xFFFF/Qt-Advan…

…ced-Docking-System

Fix using escape button when dragging non-opaque preview to cancel dr…

…ag operation (githubuser0xFFFF#114)

* Added missing overrides.

* Escape button to cancel dragging was not working in Windows either. Using the event filter added for Linux works.

Fixed a regression in DockWidgetTab that caused wron positioning of F…

…loatingDockContainer when moving the mouse

ENH: Version info using Versioneer (githubuser0xFFFF#97)

* ENH: Use versioneer for version information.

* FIX: rc.py is a build artifact and should not be version controlled.

* FIX: Move processResourceFile to its own command.