cinnamon-settings:  resize window to content size when entering a panel.

This helps prevent the 'empty' appearance some of the panels currently have.
Couple fixes, added keyboard to 'no-resize' list, map the window
so we can get toolbar heights, before navigating to a pre-selected page.
Merge branch 'resize-cinnamon-settings' of https://github.com/mtwebster/Cinnamon
Fixed the power applet showing up when moving applets in the panel