build more accurate parse tree containing comment nodes
Merge remote-tracking branch 'robocoder/nested-format-comments'
Normalizing quotation marks
changed "..." to '...' if double quotes are not required to make strings faster
Merge pull request #179 from SilexLab/develop

Normalizing quotation marks
Improve handling of escape sequence in selectors (fixes #178)
fixes #77
fixes #144 and #177
fixes #166, references #156
Update .travis.yml
Disable hhvm 3.2 build on travis

testing hhvm HEAD on master branch works
use temporary env store, so arguments are set in order-independent manner
Merge remote-tracking branch 'origin/master' into develop
use system installed phpunit
Prep 0.0.14 release; update Changelog for 0.0.13
fix typo in release date