documents glob negation
documents glob negation

Fixes #1296
prashant-andani/gulp,gulpjs/gulp,rlugojr/gulp,rlugojr/gulp,codeclimate-demo/gulp,prashant-andani/gulp,zensh/gulp,thejameskyle/gulp,sttk/gulp,thejameskyle/gulp,codeclimate-demo/gulp,zensh/gulp