Code review comment for lp:~psybers/do/intellifade

Adds 'Intellifade' as another hide option. This is pretty similar to Intellihide, but instead of sliding off screen it fades the dock to a certain opacity (0.4 default). That opacity is gconf configurable, allowing people to mimic the old AllowWindowOverlap behavior (opacity 1) or to truly mimic Intellihide but with only a different animation (opacity 0).

It also adds new functionality in that you can allow the dock to remain visible, but faded when not active. Thus I can still see my clock/weather/etc but it's faded enough to not get in my way too! =)