v0.3.0

Features

• Option root now defaults to "body", which mounts the app to document.body if left unspecified.
• Option methods is added to prevent annoying typing checks.
• No longer export App and Option interface.
• Huge performance boost. See below.

Performance

• Migrate from OOP to FP.
• Use a template for constructing text from mustache syntax, reducing update time.
• Deprecate internal waitingSubscriber, in favor of registering callback via proxy setter.