• Fixes #276 popperOptions not being used
• Fixes #193 finally (but need to attend to #274)
• Fixes #275 tippy.defaults not updating when using tippy.setDefaults()
• Fixes potential errors being thrown on window resize
• Adds .setContent() method as a shortcut to .set({ content })
• autoInit() function is deferred with setTimeout() to allow the defaults to be changed before auto-initialization