RFR: UI demo to browse Jigsaw libraries and modules

[Shi Jun Zhang]

Hi,

I want to contribute an UI demo which shows how to use Jigsaw's API to 
browse Jigsaw libraries and modules, and read the module's metadata. 
demo.modulebrowser.ModuleBrowser is the main class, it will open the 
system module library by default and a button "browse other library" is 
offered to open a file chooser and choose a custom module library folder.

Here is the webrev link:
http://cr.openjdk.java.net/~zhangshj/penrose_modulebrowser_demo/webrev.00/

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Regards,

Shi Jun Zhang