Fix Gallery Demo
Fix Gallery Demo

Getting this demo to work for the first time.
This commit includes fixes for wrong API usage,
corrects layout definition and how images are set.
The Thumbnails action is now placed on top to
avoid the extra actionbar.

mkostikov/tabris-js,softnep0531/tabrisjs,eclipsesource/tabris-js,eclipsesource/tabris-js,softnep0531/tabrisjs,mkostikov/tabris-js,eclipsesource/tabris-js,moham3d/tabris-js,paulvi/tabris-js,pimaxdev/tabris,moham3d/tabris-js,pimaxdev/tabris