Implement the hive module

Contains Hive and Swarm object to maintain collections of swarms
Implement the register API
Implement the API to update the index
Serve static files
Update package.json

- Use the last revision of smoke-signals
- Use postinstall to download an example webm file
Add the brocast script
Implement basic pieces for the client

For now the client only ask for chunks from the server
Add a .gitignore file
Update the README with a "Getting Started" section