Allow searching for multi-word commands

[mcm69]

e.g. tldr git commit

[berkus]

Linked tldr-pages/tldr-c-client#5

[waldyrious]

+:100: this would be very convenient indeed!

[Leandros]

All integrated. Update published via homebrew.

[rprieto]

I like the idea. It's a tricky one though, given that some complex commands have a page per sub-command (git-log, git-push) but some have a single page with everything (docker). Maybe joining is better than not doing anything though :)

[amitzur]

👎 man doesn't support it, and I think the commit is specific to git. Isn't it the case that not all multi word commands should be joined with a dash?

[mcm69]

@amitzur well, this is not man anyway. Also, as we do have pages for git commit and many more multi-word commands (which are saved in the format of git-commit.md), it did not make much sense searching for them as tldr git-commit. There's no such command as git-commit after all.

[igorshubovych]

Thank you for contribution. It gave me an idea on to do it.
There is more sophisticated checks done in #80.