Appmaker Logo for icons in app manifest

1. Added binary/string compatibility to s3-store.
2. Added createIconPath to url manager to create icon paths for manifest.
3. Added 3 image sizes: 60, 79, 128.
4. Added logic for generating icon json for manifest in publish.js
5. Added logic to load icon image data into memeory in publish.js.
consolidated duplicate loop over icons for publishing
moved cosolidated loops to above output file json construction
Merge pull request #1675 from secretrobotron/manifest-icons

Appmaker Logo for icons in app manifest