Make margin variables

[LivioGama]

You should transform :
const static CGFloat kTopPadding = 30;
const static CGFloat kLeftRightMargins = 20;
const static CGFloat kBottomPadding = 48;
const static CGFloat kHeaderTitlePadding = 20;
const static CGFloat kTitleDescriptionPadding = 20;
const static CGFloat kDescriptionImagePadding = 20;

in public properties initialized with default values.