FeedLeap

This adds FeedLeap to the App Gallery. I also included some suggested fixes to allow developer names with accents(e.g. José), make sure to exclude hidden folders when running `build_apps()`, and add .DS_Store to the .gitignore file.

Other than that I dig the idea of using Fabric for this. I'm a Python developer myself so I don't mind creating a virtualenv and installing any requirements. So I guess my only concern is with non-Python developers having to to install things just to add their apps into the gallery. I'm not sure if it'll become an issue. Maybe an option would be to have a base app, including the description, logo, screenshots, and manifest.json already generated so they just have to fill it out. But that only resolves part of the issue because they still have to run `build_apps()`, so they would have to submit that app package somewhere to you guys to have it actually added which kinda defeats the purpose. Maybe in the long run if this does become an issue, a form to submit your app will have to do.

Just my two cents. Cheers!