class Roadie::StyleProperty

@attr_reader [Integer] specificity specificity of parent {Selector}. Used to compare/sort.
@attr_reader [Boolean] important if the property is “!important”.
@attr_reader [String] value value of the property (such as “5px solid green”).
@attr_reader [String] property name of the property (such as “font-size”).
Domain object for a CSS property such as “color: red !important”.
@api private

def <=>(other)

non-important ones; otherwise the specificity declares order.
Compare another {StyleProperty}. Important styles are "greater than" 
def <=>(other)
  if important == other.important
    specificity <=> other.specificity
  else
    important ? 1 : -1
  end
end

def important? 

def important?
  @important
end

def initialize(property, value, important, specificity) 

def initialize(property, value, important, specificity)
  @property = property
  @value = value
  @important = important
  @specificity = specificity
end

def inspect 

def inspect
  "#{to_s} (#{specificity})"
end

def to_s 

def to_s
  [property, value_with_important].join(':')
end

def value_with_important 

def value_with_important
  if important
    "#{value} !important"
  else
    value
  end
end