1.1.0

Additions:

• Added combine(_:) methods to Future generating a single future from futures with different success types.
• Added bindTo(_:) method to Future, for completing a promise based on the output of a future.
• Added convenience filterNil() method to Subscriber for only taking the non-nil values from a Subscriber with an optional data type.
• Completed the README.md document.

Changes:

• Renamed zip to merge on Future. Sorry, I know this is a minor release, but the inconsistency was driving me nuts.

1.0.0

Version 1, ready to go!