chore(package): update gulp-csso to version 2.0.0
chore(package): update gulp-csso to version 2.0.0

http://greenkeeper.io/
arendjr/selectivity,SpeakapBV/selectivity,estantevirtual/selectivity,arendjr/selectivity,estantevirtual/selectivity,SpeakapBV/selectivity