Add rudimentry bash-completion script. Needs work.

bash-completion.sh

+#!/bin/bash
+_pass()
+{
+	local cur prev prefix suffix gen
+	COMPREPLY=()
+	cur="${COMP_WORDS[COMP_CWORD]}"
+	prev="${COMP_WORDS[COMP_CWORD-1]}"
+	prefix="$HOME/.password-store/"
+	suffix=".gpg"
+
+	if [[ $prev == --* ]]; then
+		return 0
+	fi
+	
+	for item in $(compgen -f $prefix$cur); do
+		if [[ $item == $prefix.* ]]; then
+			continue
+		fi
+		if [[ -d $item ]]; then
+			item="$item/"
+		fi
+		item="${item%$suffix}"
+		gen="$gen ${item#$prefix}"
+	done
+
+	COMPREPLY=( $gen )
+}
+complete -o filenames -o nospace -F _pass pass