2.1.0

• support initializing DOM based on template tag for shadow DOM.
• only insert DOM when cover is active. behavior controlled by resident option.
• mangle + compress minimized js to optimize its size in advance.
• lazy initializing until toggling if root is a template.
• update document for undocumented features
• member root is now a function for accessing _r (formal root)
• support inline mode
  • modal displayed inline yet not affect layout
  • dismiss on clicking outside dialog