Advanced Color Picker now works properly inside Touch devices scrollable areas

Current example doesn't demonstrate this scenario; you simply needed to set autoScroll on the picker's (Selector's) parent and put some more content in their to repro this issue; prior to this fix.
colorfield now properly reflects opacity in the preview color swatch
colorfield now properly centers color swatch when field height is stretched due to multiline label
Merge pull request #10 from CleanAsis/master

Improvements and fixes to Advanced Color Picker