Fix: Fallback to not formatting defaultProps (styleguidist#564)

Fix: Disable isolation for global CodeMirror styles

Fixes styleguidist#561

Fix: Read showCode option from the right place

styleguidist#561

Fix: Support to enable HMR for component dependencies (styleguidist#557)

Fixes styleguidist#551

Fix: Only use primary style for top level sections (styleguidist#555)

Fixes styleguidist#554

Fix: Hide empty path line (styleguidist#558)

Fix: Render null and undefined defaultValues as code (styleguidist#556)

Fix: Clean lib directory before compilation

Fix: Improve shape defaultProp rendering (styleguidist#535)

Closes styleguidist#524