server: Default to feed title as the feed name if no name is provided by the client.
client: Simplified subscription form.
build.ps1: Simplified script.
Big commit.

server: Replaced promises implementation with await/defer from IcedCoffeeScript.
server: Changed XML and feed parsers to work with streams instead of strings.
server: Implemented /summary and removed the index handler.
client: Implemented /summary and moved www/* under /.
server: Added patch for ICS to output valid filenames in generated JS.