Version 1.4.2 release

Here are the changes:

• [Requirement] Postpone visual part rendering after source code changed
• [Requirement] Add more selection support in visual part
• [Requirement] Support selected area changed if SHIFT key is pressed
• [Requirement] Tag handler: rename "Output nothing" to "Output child", add "Ignore"(ignore all child nodes process)
• [Requirement] Change save behavior of editor preference
• [Bug] Cursor move to wrong position in some case
• [Bug] Outlined area of hidden SPAN element is wrong
• [Bug] node.removeElementTag() does not work

Postpone visual part rendering could improve the performance when you continuous typing or format source code. Please feedback if you have other suggestion.