It's alive!

It's an initial release. Features we have at start:

• Stream as a discrete line of events, coupled with time
• Box as a continuous value, changing with time
• map and filter
• flatMapAll and flatMapLast, which are flatMap for Stream and Box respectively
• skipDuplicates
• recover to deal with errors
• merge for streams
• zipWith for boxes
• Boolean algebra for boxes
• Constructor from promise
• Constructor from DOM events