Fix shebangs and executable flags (related to #124)

Files that are executable now all have the /usr/bin/env type shebang,
while all files that should only be source from other files have the /bin/bash shebang

lib/submodule_files.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # This script is meant to be used in conjunction with
 # `git submodule foreach'.
 # It runs outputs all files tracked by a submodule.

test/fixtures/135.abc.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 (
 	local git_username="Homeshick user"
 	local git_useremail="homeshick@example.com"

test/fixtures/dotfiles.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 (
 	local git_username="Homeshick user"
 	local git_useremail="homeshick@example.com"

test/fixtures/module-files.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 (
 	local git_username="Homeshick user"
 	local git_useremail="homeshick@example.com"

test/fixtures/nested-submodules.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 (
 	local git_username="Homeshick user"
 	local git_useremail="homeshick@example.com"

test/fixtures/nodirs.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 (
 	local git_username="Homeshick user"
 	local git_useremail="homeshick@example.com"

test/fixtures/rc-files.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 (
 	local git_username="Homeshick user"
 	local git_useremail="homeshick@example.com"

test/fixtures/repo with spaces in name.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 (
 	local git_username="Homeshick user"
 	local git_useremail="homeshick@example.com"

test/fixtures/submodule-outside-home.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 (
 	local git_username="Homeshick user"
 	local git_useremail="homeshick@example.com"

test/fixtures/symlinks.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 (
 	local git_username="Homeshick user"
 	local git_useremail="homeshick@example.com"

test/helper.bash

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/bash
 
 function export_env_vars {
 	if [[ -n $BATS_TEST_DIRNAME ]]; then

test/setup-default.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 printf '\nsource "$HOME/.homesick/repos/homeshick/homeshick.sh"' >> $HOME/.bashrc
 cat > $HOME/.bashrc <<EOF
 source "$HOME/.homesick/repos/homeshick/homeshick.sh"