new register demo page and display image size

git-svn-id: https://plugins.svn.wordpress.org/momapix-image-selector/trunk@867040 b8457f37-d9ea-0310-8a92-e5e31aec5664
adding json parse with display demo

git-svn-id: https://plugins.svn.wordpress.org/momapix-image-selector/trunk@867043 b8457f37-d9ea-0310-8a92-e5e31aec5664