ftplugin/ruby.vim: Add command to stop Spring

I love Spring, it makes it so much nicer to run tests in Rails apps.
That's why I set 'vim-rspec' to use it. However, sometimes it gets
confused and doesn't load the latest code, and a load error occurs.

Recently I started a new project and those errors occur every few times
I run the tests. It's absolutely unbearable. To make life a tiny bit
easier, make a command that allows us to stop Spring from Vim, to avoid
having to <C-z> and type the command by hand.

You can tell I was frustrated when I decided to make this command.

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