Improve RangeSlider mouse pressed handling. Now all previewmouse events handled by stackpanel.
Merge pull request #1152 from QuantumDeveloper/RangeSlider

RangeSlider V2.3
let's add these things back
Fixed 4.5 projects.
Merge branch 'ribbon-menu-support' of https://github.com/Tide/MahApps.Metro into Ribbon