Reduce ImageView sample picture sizes

Used jpegtran to rewrite Huffman tables in JPEGs to reduce
the file size for the ImageView sample.

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #67 from enyojs/optimize-imageview-assets

Reduce ImageView sample picture sizes

Reviewed-By: Ben Combee (ben.combee@lge.com)