Add .ondescribe

[CodeLenny]

Client data passed once can be evaluated different ways.

cheerio = require "cheerio"
{it} = require "mocha"
test = new ModuleTest "Has correct structure"
test
  .html "..."
  .coffee "..."
  .ondescribe "Gets data", "data", (payload) ->
    $ = cheerio.load payload
    it "has 5 paragraphs", ->
      $("p").length.equals 5
    it "has an #aboutme section", ->
     $("#aboutme").length.equals 1

• Implement
• Test
• Document