add new dump command

[Daniel Dörrhöfer]

You could also export all passwords to a csv file.

https://github.com/d4ndo/pass2gorilla


Dusty Mabe:
> 
> Hi, Thanks for the very useful "pass" program. I'd like to enhance
> pass to be able to dump out all passwords in the database to the
> screen. Basically like `pass show <pass>` but for all passwords
> instead of just a specific one. I created a new "dump" command to
> achieve this. I toyed with the idea of implementing this functionality
> with `pass show --all` instead of `pass dump` but modifying the
> cmd_show() function was going to be a little more tricky to get right.
> 
> Let me know what you think!
> 
> Dusty 
> 
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