Fixed for results displaying more than once when specifying a formatter

The modified line was not taking into account a :cli formatting option like this: '--format=documentation' because the .include? test compares the entire line and not just the '--format' option specifier.

This fix greps for the format specifier at the beginning of the string and will disregard the '=' sign and anything that follows.

lib/guard/rspec/runner.rb

@@ -30,7 +30,7 @@ def rspec_command(paths, options={})
         cmd_parts << "bundle exec" if (bundler? && options[:binstubs] == true && options[:bundler] != false) || (bundler? && options[:bundler] != false)
         cmd_parts << rspec_exec(options)
         cmd_parts << options[:cli] if options[:cli]
-        cmd_parts << "-f progress" if options[:cli].nil? || !options[:cli].split(' ').any? { |w| %w[-f --format].include?(w) }
+        cmd_parts << "-f progress" if options[:cli].nil? || !options[:cli].split(' ').any? { |w| %w[-f --format].grep(/^#{w}/) }
         cmd_parts << "-r #{File.dirname(__FILE__)}/formatters/notification_#{rspec_class.downcase}.rb -f Guard::RSpec::Formatter::Notification#{rspec_class}#{rspec_version == 1 ? ":" : " --out "}/dev/null" if options[:notification] != false
         cmd_parts << "--failure-exit-code #{failure_exit_code}" if failure_exit_code_supported?(options)
         cmd_parts << paths.join(' ')