REQ: --Watch option for minify

[brianlayman]

Great tool. I love that it minifies css js AND images. My only request would be a watch option be added to minify as well. That would perfectly fit my need.

[karthikv]

Glad you like it! :) Would be happy to accept a pull request for a minify watch option. Otherwise, you can use something like fswatch to run nodefront minify when your files are changed.