Add expo and scale applets

todo:  make applet icons themeable
Removed some left-over non-working code.
Merge pull request #795 from autarkper/expo-dead-code-fix

Remove some left-over non-working code.
Merge pull request #793 from mtwebster/applets

Add expo and scale applets
Fixes and improvements for new Scale and Expo applets
Fixed typo in svg file
Updated NEWS file
More explicit icon for removable applet
Added support for Audacious in sound applet (issue #804)
different heights for different panels (top and bottom)
Center mouse pointer on screen when Cinnamon starts (fix for issue #808)
Handle orientation changes in settings applet (fix for issue #689)
Missed one.
Added edge flip
Added edgeFlip.js to Makefile
Fixed typo
Code Cleanup
Added edge-tiling option in cinnamon settings
Fixed typos
Use Muffin to show/unshow the desktop