0.6.0

• Added line to Slice.ContentType and LinePreferences. Now supports a curved line inside a slice;
• Optional backgroundColor added to Slice. You can now override a background color for specified Slice, during Slice initialization;
• Optional centerImageAnchor added to WheelPreferences. You can now add a secondary anchor image for each slice that will be located at the center of wheel’s border;
• Examples updated;