chjj/marked — pull request #260 by supersheep (2013-10-11 09:07:12+00:00)
Title: fix: `options` is optional

when `opt` is not passed, opt should be default options, or an error will be raised when accessing `opt.highlight`.

Sorry for not adding testcase, I don't know how, wish to see mocha or other testsuit in the future :)