Implement <h-line> [Fixes #106]

Note: original inky's implementation seems completely broken
foundation/inky#137
foundation/inky#136

lib/inky.rb

@@ -20,7 +20,8 @@ def initialize(options = {})
         callout: 'callout',
         spacer: 'spacer',
         wrapper: 'wrapper',
-        menu_item: 'item'
+        menu_item: 'item',
+        h_line: 'h-line',
       }.merge(::Inky.configuration.components).merge(options[:components] || {})
 
       self.component_lookup = components.invert

lib/inky/component_factory.rb

@@ -141,6 +141,12 @@ def _transform_spacer(component, _inner)
       end
     end
 
+    def _transform_h_line(component, _inner)
+      classes = _combine_classes(component, 'h-line')
+      attributes = _pass_through_attributes(component)
+      %{<table #{attributes}class="#{classes}"><tr><th>&nbsp;</th></tr></table>}
+    end
+
     def _transform_wrapper(component, inner)
       attributes = _combine_attributes(component, 'wrapper')
       %{<table #{attributes} align="center"><tbody><tr><td class="wrapper-inner">#{inner}</td></tr></tbody></table>}

spec/cases/h_line/basic.inky

@@ -0,0 +1 @@
+<h-line/>

spec/cases/h_line/multiple.inky

@@ -0,0 +1,8 @@
+<!-- pending https://github.com/foundation/inky/issues/137 --->
+Hello
+<h-line/>
+World
+<h-line foo="bar"/>
+Bye
+<h-line class="x" foo="bar"/>
+Zzz

spec/cases/h_line/with_attr.inky

@@ -0,0 +1,2 @@
+<!-- pending https://github.com/foundation/inky/issues/137 --->
+<h-line foo="bar"/>