v0.7.4

• Fix: Remove event listeners from CompositeStream once closed and
  remove undocumented left-over close event argument
  (#116 by @clue)

• Minor documentation improvements: Fix wrong class name in example,
  fix typos in README and
  fix forward compatibility with upcoming EventLoop releases in example
  (#113 by @docteurklein and #114 and #115 by @clue)

• Improve test suite by running against Mac OS X on Travis
  (#112 by @clue)