Builder has class methods for every tag

Shorthand: If you know the top-level tag you want to render, you can
call `Builder.div class: "foo", -> ...` instead of calling render.

spec/stdlib/template/builder-spec.coffee

@@ -6,8 +6,20 @@ describe "Builder", ->
 
   beforeEach -> builder = new Builder
 
+  describe "tag class methods", ->
+    it "calls render, assuming the arguments to the current method as the first tag", ->
+      fragment =
+        Builder.div ->
+          @ol class: 'cool-list', =>
+            @li()
+            @li()
+
+      expect(fragment).toMatchSelector('div')
+      expect(fragment.find('ol.cool-list')).toExist()
+      expect(fragment.find('li').length).toBe 2
+
   describe "@render", ->
-    fit "runs the given function in a fresh builder instance and returns the resulting view fragment", ->
+    it "runs the given function in a fresh builder instance and returns the resulting view fragment", ->
       fragment =
         Builder.render ->
           @div =>

src/stdlib/template/builder.coffee

@@ -23,13 +23,25 @@ class Builder
     void: 'area base br col command embed hr img input keygen link meta param
       source track wbr'.split /\s+/
 
-
   @allElements: ->
     @elements.normal.concat(@elements.void)
 
-  _.each @allElements(), (tagName) =>
+  @buildTagClassMethod: (tagName) ->
+    this[tagName] = (args...) ->
+      @render ->
+        argsWithBoundFunctions = args.map (arg) =>
+          if _.isFunction(arg)
+            _.bind(arg, this)
+          else
+            arg
+        @tag(tagName, argsWithBoundFunctions...)
+
+  @buildTagInstanceMethod: (tagName) ->
     @prototype[tagName] = (args...) -> @tag(tagName, args...)
 
+  @allElements().forEach (tagName) => @buildTagClassMethod(tagName)
+  @allElements().forEach (tagName) => @buildTagInstanceMethod(tagName)
+
   constructor: ->
     @reset()