Bug 1029201 - Large app icons are 284px, not 289px

This commit was generated by running the following shell commands to move all the files to the proper locations:

```sh
  find apps -name "*_289.png" -exec sh -c 'FILE=`echo {} | sed -e "s/289/284/"`; git mv {} $FILE' \;
  ln -fs apps/wallpaper/style/icons/wallpaper_284.png apps/homescreen/everything.me/images/wallpaper_284.png
  find apps -name "manifest.webapp" -exec sed -i 's/289/284/g' {} \;

  find shared -name "*_289.png" -exec sh -c 'FILE=`echo {} | sed -e "s/289/284/"`; git mv {} $FILE' \;
```

Plus, I manually edited `apps/browser/index.html`.