Add info about jQM properties tab

Use Case: widget wizard offers useful way for those new to jQM to edit output code snippets. But widget wizards are only for adding new items to files. So need feature to edit in widget wizard manner once in file.

Feature: Properties view has been enhanced for jQuery Mobile and HTML(5). Previously properties view was simply a table with attributes and values. Now has fields similar to those in widget wizards making it easier for those new to jQM to modify code snippets once in file.

Writer Task: Create new topic within Features section, 'Managing??' Add info about purpose of enhanced properties view and how to access and edit. Add a screen cap of a sample properties tab view. Also update 'About Features' topic with new bullet for action.