title: Guard Rspec :cli option is deprecated, change to :cmd option
body: <p>Working <code>Guardfile</code>in my rails app</p>
  
  <p><code>guard 'rspec', all_after_pass: false, cli: '--drb' do</code></p>
  
  <p>Not working <code>Guardfile</code></p>
  
  <p><code>guard 'rspec', all_after_pass: false, cmd: '--drb' do</code></p>
  
  <p>I've opened guard with <code>bundle exec guard</code> many times, but I found even though I receive this message
  <code>Guard::RSpec DEPRECATION WARNING: The :cli option is deprecated. Please customize the new :cmd option to fit your need.</code>
  and I make the proper changes, :cli is the only one working with rspec. </p>
  
  <p>terminal output for <code>:cli</code></p>
  
  <pre><code>01:49:14 - WARN - Guard::RSpec DEPRECATION WARNING: The :cli option is deprecated. Please customize the new :cmd option to fit your need.
  01:49:15 - INFO - Guard is using Growl to send notifications.
  01:49:15 - INFO - Guard is using Emacs to send notifications.
  01:49:15 - INFO - Guard is using TerminalTitle to send notifications.
  01:49:15 - INFO - Starting Spork for RSpec
  Using RSpec, Rails
  Preloading Rails environment
  Loading Spork.prefork block...
  Spork is ready and listening on 8989!
  01:49:17 - INFO - Spork server for RSpec successfully started
  
  01:49:17 - INFO - Guard::RSpec is running
  01:49:17 - INFO - Guard is now watching at '/Users/me/rails_projects/mvp'
  [1] guard(main)&gt; 
  01:49:18 - INFO - Run all
  01:49:18 - INFO - Running all specs
  Running tests with args ["--color", "--failure-exit-code", "2", "--format", "progress", "--format", "Guard::RSpec::Formatter", "--require", "/Users/me/.rvm/gems/ruby-2.1.0@rails40/gems/guard-rspec-4.2.4/lib/guard/rspec/formatter.rb", "spec"]...
  ......................................................................
  
  Finished in 0.76464 seconds
  70 examples, 0 failures
  
  Randomized with seed 47137
  
  Done.
  </code></pre>
  
  <p>terminal output for <code>:cmd</code></p>
  
  <pre><code>bundle exec guard
  01:58:55 - INFO - Guard is using Growl to send notifications.
  01:58:55 - INFO - Guard is using Emacs to send notifications.
  01:58:55 - INFO - Guard is using TerminalTitle to send notifications.
  01:58:55 - INFO - Starting Spork for RSpec
  Using RSpec, Rails
  Preloading Rails environment
  Loading Spork.prefork block...
  Spork is ready and listening on 8989!
  01:58:57 - INFO - Spork server for RSpec successfully started
  
  01:58:57 - INFO - Guard::RSpec is running
  01:58:57 - INFO - Guard is now watching at '/Users/me/rails_projects/mvp'
  [1] guard(main)&gt; 
  01:58:59 - INFO - Run all
  01:58:59 - INFO - Running all specs
  
  [2] guard(main)&gt; 
  </code></pre>
  
  <p>Just leave the <code>:cli</code> or is there a solution?</p>