I have tried all solution listed here and here but I always end up with an error similar to the one below :
TypeError: Cannot read property 'forEach' of undefined
at grunt.initConfig.browserSync.livereload.options.middleware (...
or
TypeError: undefined is not a function...
This question is at least one year later and I realised a lot has changed in grunt so I am not surprised if these answers no longer work.
Is there a new solution to this question for Nov 2015?