Basic program volume control created.
Added supported gnome-shell versions.
Added header comment and fixed code's formating.
Replaced title with PopupSwitchMenuItem.
Code cleanup.
Removed .helloworld-label styles.
Created Makefile with deploy target.
Tested Gnome 3.4.0
Added stream icon and done some refactoring.
Tested with Gnome 3.4
Version 2
Limited extensions width.
Fixed max-width to 0px.
Stream icon-size is now 22px.
Version updated
Added stylesheet.css to depoy target
Rebuilded AdvPopupSwitchMenuItem:
 - used St.BoxLayout
 - now there isn't any odd spaces
Added simple output sink selection.
Fixed extension disabling.
Enabling is currently broken.
Fixed extension enabling and disabling.