[Patch] add '-C store-dir' option to switch password store dir

[lio at lunesu.com]

Correct, but that env var is not obvious until looking at the code and the ‘-C dir’ option is not uncommon for other tools (like git, tar). 

More context: at work we're using pass for managing many project secrets which are scoped per project and not in the user profile folder. Switching between folders is a lot easier (and looks less hacky) with `pass -C . …` compared to `env PASSWORD_STORE_DIR=. pass …`. 

Having this switching the store_dir as a first-class supported option, knowing to the "prior-art” of other tools and the small size of the diff, it seems like a good idea for inclusion into pass.

Lio.

> On 31 Jan 2019, at 05:32, Reto Brunner <brunnre8 at gmail.com> wrote:
> 
> Whats wrong with just setting PASSWORD_STORE_DIR?
> Both can be done from the command line or a script, I don't see the benefit of changing it to a parameter instead.
> 
> Can you enlighten me?
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