3.4.0 - more responsive scroll & cursor drag for touch modes

New options
- rtlmode, horizontal div scrolling starts at left side (default:false)
- cursordragontouch, drag cursor in touch / touchbehavior mode also (default:false) - #177

Changed features
- new wheel event routine, more responsive and consistent scrolling by mousewheel - fixes #193
- change speed on scrolling by cursors, more responsive
- change speed on drag scrolling, more responsive

Fixes
- IE8, cursor not hidden with autohidemode=true - close #183
- IE8-, detection of rail active click event position not correct