Install guard-livereload in Ubuntu

gistfile1.txt

$ sudo apt-get install ruby-dev
$ sudo gem install bundle
$ sudo gem install guard
$ sudo gem install guard-livereload

cd to project folder
$ bundle init

open .Gemfile, add following:
gem 'guard'
gem 'guard-livereload'

back to terminal
$ bundle exec guard init livereload

open .Guardfile, add following:
# https://github.com/guard/guard-livereload
guard :livereload do
  watch(%r{.+.(css|js|html|php)$})
end

back to terminal
$ bundle exec guard