add "broccoli-plugin" keyword
add "broccoli-plugin" keyword

This should make it show up in http://broccoliplugins.com/ (and the Broccoli site also mentions to search for the keyword "broccoli-plugin" at npmjs.org).
rlivsey/broccoli-concat,ember-cli/broccoli-concat,broccolijs/broccoli-concat,joliss/broccoli-sourcemap-concat,broccolijs/broccoli-concat,rlivsey/broccoli-concat,joliss/broccoli-sourcemap-concat,ember-cli/broccoli-concat,ef4/broccoli-sourcemap-concat,joefiorini/broccoli-sourcemap-concat,joefiorini/broccoli-sourcemap-concat,ef4/broccoli-sourcemap-concat