(Request) Make Screeshot Plugin "Save as .jpg"

The update for the Make Screenshot plugin will be released later this week.

A small announce of the changes:
* save with .jpg instead of .jpeg
* capture window with clear background for glass or transparent windows
* capture transparent or glass windows into PNG with transparency
* improved capture region (added the zoomed image under the cursor, and position and size information)
* option to capture the mouse cursor
* capture one monitor only (where the mouse cursor is)

what I plan to make in the next release also, but not sure:
** count down in the plugin icon
** change icon depending of the capture mode
** a simple markup tool