Adds three add-ins: Taj Mahal, Christ the Redeemer and Colosseum
Hosted manifest file: https://abhimanyusirohi.github.io/test-addins/seven-wonders-manifest.json
Shows the OAuth workflow using Dropbox as identity provider
Hosted manifest file to add: https://abhimanyusirohi.github.io/test-addins/dropbox-oauth-example-manifest.json
Note that this add-in adds itself to the toolbar
Hosted manifest file to add: https://abhimanyusirohi.github.io/test-addins/toolbar-addin-manifest.json