Add ImageDiffAIR to utilities folder.  This version also has some new improvements such as:
1) remembers last folder you viewed and on startup, returns to that folder.  (Works on mac, needs debugging on windows)
2) can use ctrl-a to select all images
3) can use left arrow right arrrow to move to previous/next images
4) shows number of pixels with color variances.

git-svn-id: https://svn.apache.org/repos/asf/flex/sdk/branches/develop@1433199 13f79535-47bb-0310-9956-ffa450edef68