Progress indicators

So most of the progress indicator features are worked out.
This pull addresses issues #84, #30, #16 (and #29 in a way.)

Right now there is a progress panel started when the send test e-mail button is
pushed, but that can easily be removed, since the spinner and indicator globe are
currently functional, let me know what the verdict is.

If autopkg changes it's --report-plist behavior we'll be able to provide quite a bit
more feedback when the "Check Apps Now" button is pressed.