Improved compatibility: change"/bin/[x]" to "/usr/bin/env [x]" (#265)

changed paths of the form "/bin/[x]" into "/usr/bin/env [x]" (#265)

bin/_blackbox_common.sh

@@ -140,7 +140,7 @@ function fail_if_not_on_cryptlist() {
 
   if ! is_on_cryptlist "$name" ; then
     echo "ERROR: $name not found in $BB_FILES" >&2
-    echo "PWD=$(/bin/pwd)" >&2
+    echo "PWD=$(/usr/bin/env pwd)" >&2
     echo 'Exiting...' >&2
     exit 1
   fi

blackbox.plugin.zsh

@@ -1,4 +1,4 @@
-#!/bin/zsh
+#!/usr/bin/env zsh
 # The MIT License (MIT)
 
 # Copyright (c) 2014 Stack Exchange, Inc.

tools/profile.d-usrblackbox-test.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
 # Test profile.d-usrblackbox.sh
 

tools/test_functions.sh

@@ -47,7 +47,7 @@ function assert_file_missing() {
 function assert_file_exists() {
   if [[ ! -e "$1" ]]; then
     echo "ASSERT FAILED: ${1} should exist."
-    echo "PWD=$(/bin/pwd -P)"
+    echo "PWD=$(/usr/bin/env pwd -P)"
     #echo "LS START"
     #ls -la
     #echo "LS END"