Add different customization options

[stanmots]

Here is a list of new customization options:

• Customize picker view background color. Usage:

[[IQActionSheetPickerView appearance]setPickerViewBackgroundColor: [UIColor orangeColor]];

• Customize picker components font and color: Usage:

[[IQActionSheetPickerView appearance]setPickerComponentsColor: [UIColor grayColor]];

[[IQActionSheetPickerView appearance]setPickerComponentsFont: [UIFont systemFontOfSize:17.0]];

• Customize cancel and done button title attributes. Usage:

NSDictionary *attributesForNormalState = @{NSForegroundColorAttributeName: [UIColor redColor], NSFontAttributeName: [UIFont systemFontOfSize: 18.0] };

[[IQActionSheetPickerView appearance]setCancelButtonAttributes: @{ kAttributesForNormalStateKey: attributesForNormalState}];

And as a bonus: the picker can be dismissed now on a background (dimmed view) tap.