Update demos and solve some issues

Clean demos for GitHub working page and add functionalities explanation.
Add modal dialog when in FullScreen.
Solve tooltip bugs for gcviz logo in Firefox.
Solve background text issue in Windows. Now text measure color is the same as the line.
When pan the map, cursor goes back to active tool.
Solve print issue in IE.
Location window is now Knockout and open at the right place.
Exclude header and footer height from map size.
Fullscreen (new tooltip, new button).