Added workaround: canvas.getDataUrl() not supported on iPad Safari.
Merge branch 'ipad-bug'

* ipad-bug:
  Added workaround: canvas.getDataUrl() not supported on iPad Safari.
Fix some style and syntax issues in PtiffImageStore
Merge branch 'ptiffimagestore-style'

* ptiffimagestore-style:
  Fix some style and syntax issues in PtiffImageStore