Merge pull request #84 from IonelScutelnicu/master
[BUGFIX] Add mbstring extension to composer.json

This helps it work on heroku, where mbstring isn't available by default.
Merge pull request #93 from captn3m0/patch-1

Adds mbstring extension to composer.json
Merge pull request #85 from jdchmiel/master

Prevent incorrectly capitalized CSS selectors from being stripped