Fixed issue when  mixin's block is used as part of a property value. Closes #1712
Fix nested selectors  when using nested and bubbled media queries. #1678
fix css syntax in 2nd variable example
fix docs typos (hslaa->hsla, hsla->hsl)
document basename, dirname, extname and pathjoin
Merge pull request #1716 from JasonWoof/doc-tweaks

Doc tweaks
Remove hardcoded `.styl` extension from CLI
Fix docs for `add-property` bif. Closes #1721
Fix regression #1727 + small fixes for #1717
Merge branch 'master' into dev

* master:
  exit with success after successfully performing requested action
  Added missing `vmax` unit
0.49.2