[pass] Multi-user pass / group pass

[Jason A. Donenfeld]

Cool, it works:

zx2c4 at Dell ~/Projects/password-store/src $ ./password-store.sh init
--reencrypt "Jason at zx2c4.com"
Password store initialized for Jason at zx2c4.com.
[master f344576] Set GPG id to Jason at zx2c4.com.
 1 file changed, 1 insertion(+), 1 deletion(-)
‘/home/zx2c4/.password-store/AIM/zx2c4.gpg.new’ ->
‘/home/zx2c4/.password-store/AIM/zx2c4.gpg’
...
[master 1b979aa] Reencrypted entire store using new GPG id Jason at zx2c4.com.
 73 files changed, 0 insertions(+), 0 deletions(-)
 rewrite AIM/zx2c4.gpg (100%)
...


pass init -e blah   or
pass init --reencrypt blah

Committed here:
http://git.zx2c4.com/password-store/commit/?id=93c025c69aac8867916bbd0f5813765fac7d852b

Comments & suggestions on the implementation are welcome as always.