Switch to true Markdown options as default
Switch to true Markdown options as default

It turns to `true` the `html` and `linkify` options of `markdown-it`.
This is more similar behavior with the previous Markdown parser. Fixes #344.

mborman/yuidoc-asp,regru/yuidoc,mborman/yuidoc-asp,greyhwndz/yuidoc,mixonic/yuidoc,mixonic/yuidoc,greyhwndz/yuidoc,greyhwndz/yuidoc,mixonic/yuidoc,regru/yuidoc,mborman/yuidoc-asp,regru/yuidoc