Add the base of the PolygonEditionHelper
This provides a generic way to edit list of mask polygons.
Merge branch 'master' into polygon-edition-helper
Can now change the selected polygon/point from the editor
Make some adjustments in the PolygonEditionHelper
Merge branch 'master' into polygon-edition-helper
Merge branch 'master' into polygon-edition-helper
Fix polygon include in PolygonEditionHelper
Add documentation to PolygonEditionHelper
Added basics tests for GDCpp
RuntimeScene can be used without window (renderWindow == NULL).
Fix the axis list in the Joystick selection dialog
Merge pull request #27 from victorlevasseur/joystick-dialog-fix

Fix the axis list in the Joystick selection dialog
Merge pull request #25 from victorlevasseur/polygon-edition-helper

Added PolygonEditionHelper to make polygon edition easier and adaptable to other object editors.
Merge branch 'master' of github.com:4ian/GD
Activated GDCpp tests for Travis-CI