Use an AspectFrame to ensure all looks good

size request increased from 350 to 480 by Parin
https://bugzilla.gnome.org/show_bug.cgi?id=733520
Remember window size and state

Default window width/height increased
from 540x500 to 730x630 by Parin
https://bugzilla.gnome.org/show_bug.cgi?id=733520
Correct code style and clean-up unused code

https://bugzilla.gnome.org/show_bug.cgi?id=733520