v1.0.0

• New playbackRate prop (#53 Thanks @Akurganow! 🎉 )
• Use late-bound props when calling sound callbacks. Causes most recent callback props to be called. Fixes #16.
• Update soundmanager2 required version.
• Add support for React 16, and move React to peer deps.
• Use process.env.NODE_ENV to determine which build to use for soundmanager2. In prod the nodebug build is used. (Fixes #13, #42)