Fixing a typo.
Added verticalPadding property

verticalPadding is the amount of vertical space between HUD elements (labels, indicators, or custom views).
Added shadedBackgroundOpacity property.

Covers the HUD background view with a uniform amount of shading (0 - 1).
Defaults to 0. Only used if dimBackground is NO.
Updated demo to show use of labelColor and shadedBackgroundOpacity.