SSCAN, HSCAN, ZSCAN are not handled correctly

[bnymn]

These commands are almost the same with SCAN command according to this documentation.

"hscan"            => [ :first ],
"hscan_each" => [ :first ],
..
"sscan"            => [ :first ],
"sscan_each" => [ :first ],
..
"zscan_each"       => [ :first ],
"zscore" => [ :first ],

They should configured like the following:

"scan"             => [ :scan_style, :second ],
"scan_each" => [ :scan_style, :all ],

I'm getting the following error if I use SSCAN command.

$redis.sscan(0)
ArgumentError: wrong number of arguments (given 1, expected 2..3)
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis.rb:2603:in `sscan'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/redis-namespace-1.5.2/lib/redis/namespace.rb:393:in `call_with_namespace'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/redis-namespace-1.5.2/lib/redis/namespace.rb:290:in `method_missing'
	from (irb):5
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-4.2.7.1/lib/rails/commands/console.rb:110:in `start'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-4.2.7.1/lib/rails/commands/console.rb:9:in `start'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-4.2.7.1/lib/rails/commands/commands_tasks.rb:68:in `console'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-4.2.7.1/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-4.2.7.1/lib/rails/commands.rb:17:in `<top (required)>'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.7.1/lib/active_support/dependencies.rb:274:in `require'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.7.1/lib/active_support/dependencies.rb:274:in `block in require'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.7.1/lib/active_support/dependencies.rb:240:in `load_dependency'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.7.1/lib/active_support/dependencies.rb:274:in `require'
	from /ssd/Projects/news2023.com/bin/rails:9:in `<top (required)>'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.7.1/lib/active_support/dependencies.rb:268:in `load'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.7.1/lib/active_support/dependencies.rb:268:in `block in load'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.7.1/lib/active_support/dependencies.rb:240:in `load_dependency'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.7.1/lib/active_support/dependencies.rb:268:in `load'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/commands/rails.rb:6:in `call'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/command_wrapper.rb:38:in `call'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application.rb:191:in `block in serve'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application.rb:161:in `fork'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application.rb:161:in `serve'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application.rb:131:in `block in run'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application.rb:125:in `loop'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application.rb:125:in `run'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application/boot.rb:19:in `<top (required)>'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /home/bunyamin/.rbenv/versions/2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from -e:1:in `<main>'

[corincerami]

What's needed I believe is to update the method_missing in lib/redis/namespace.rb to properly pass keyword arguments, like def method_missing(command, *args, **kwargs, &block) and then call_with_namespace(command, *args, **kwargs, &block).

[PatrickTulskie]

Feel free to throw up a PR for this fix. I don't use those parts of Redis myself but if you have experience with them and can verify they work and include tests then that's cool with me.