Change mechanisim of imagedragging-prevention when touch is enabled

New Version Version 0.8.1
Add new target and insertion options for pagers and buttons

Update destroy tests
New Version 0.8.2
Add event unbinding for imagedragging in initialized touch feature
Refactored calculation of dimensions

Removed aspectratio for resize function option (autoresizeKeepRatio)
New Version 0.8.3
Update dimension calculation including padding