v0.5.2

Features

• Support verbose configuration. It decides whether warning&error message will be output.
• Add a static method .isHighlightWrapNode(). You can use it to test whether a node(DOM) is a highlight wrapper.

Fix

• Prevent emit REMOVE event when no node is affected by calling .remove() and .removeAll()
• Fix the bug in .getAll, now it will return correct data
• Prevent injecting duplicate stylesheets when one has been injected

Other updates

• Add a suit of unit tests to ensure the code quality.
• Refactor the way of error reporting.
• Remove .dataset polyfill.