Merge pull request #122 from seven-phases-max/master

Denoted the HSL-space functions as HSL-space functions.
command-line-usage.md: set --global-var/--modify-var to the most saf syntax
Added Python Less port (#123).
http://centage.peruste.net: minor editing...
Make importing easier to read
Fix typo
Merge pull request #127 from lammertw/patch-2

Fix typo
Merge pull request #126 from lammertw/patch-1

Make importing easier to read
fixed &pi; entity inside code block
fixed &pi; entity inside code block
Merge pull request #129 from floriangaechter/master

fixed &pi; entity inside code block
Online Web IDEs: added 'Fiddle Salad' (#128), changed jsFiddle link to pre-configured snippet, sorted alphabetically.
Added Chinese translation of the latest documents.
Merge pull request #130 from wangsai/chinese-translation

Added Chinese translation of the latest documents.
Reworked "Parent Selectors" section.