Added slide buttons to PrinterListItem. No functionality
Merge branch 'development' of https://github.com/gregory-diaz/MatterControl into development

Conflicts:
	PrinterControls/PrinterConnections/PrinterListItems.cs
Merge remote-tracking branch 'upstream/development' into development
Fixed a memory leak in ViewGcodeBasic.
Made sd files load into an empty queue
Merge branch 'development' of https://github.com/MatterHackers/MatterControl into development
Merge remote-tracking branch 'Greg/development' into development
Merge pull request #65 from jlewin/development

Fix extruder index
 Invoke ShowMessageBox on UI Thread