yatskevich/grunt-bower-task — pull request #94 by simpixelated (2013-12-23 21:32:13+00:00)
Title: add config object that's passed to bower.install

This allows the user to specify offline mode, or any other supported config options defined by bower:
https://github.com/bower/bower/blob/13d37b9d5f971dd298b246bbc2a4233cc2137dd6/lib/config.js

force: { type: Boolean, shorthand: 'f' },
offline: { type: Boolean, shorthand: 'o' },
verbose: { type: Boolean, shorthand: 'V' },
quiet: { type: Boolean, shorthand: 'q' },
loglevel: { type: String, shorthand: 'l' },
json: { type: Boolean, shorthand: 'j' },
silent: { type: Boolean, shorthand: 's' }

These differ from the options support added for #83 in that they are available to other bower commands than just "install". I'm not really sure of their usefulness, except for offline mode.