Adapt shebangs

Convert all shebangs to /usr/bin/env bash, if bash is really required in
the script. Otherwise convert it to /bin/sh.

/bin/bash is not available on all systems, while /usr/bin/env bash and
/bin/sh are.

shell/aliases.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+
 #alias definitions
 alias chmox="chmod +x"
 alias cd..="cd .."

shell/cd.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+
 #correct some fast tipped cds
 function c {
 	if [ $1 == "d.." ]; then

shell/command-not-found.sh

@@ -1,2 +1,3 @@
 #!/bin/sh
+
 [ -r /etc/profile.d/cnf.sh ] && . /etc/profile.d/cnf.sh

shell/extract.sh

@@ -1,3 +1,5 @@
+#!/bin/sh
+
 x() {
 	for zipfile in $*; do
 		local extractor

shell/liquidprompt.sh

@@ -1,3 +1,5 @@
+#!/bin/sh
+
 #LP_ENABLE_RUNTIME=1
 LP_ENABLE_TITLE=1
 LP_ENABLE_SSH_COLORS=1

shell/load

@@ -1,4 +1,5 @@
 #!/bin/sh
+
 for profile in ~/.profile.d/*.sh; do
 	if [ -x "$profile" ]; then
 		source $profile

shell/paths.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+
 function set_path(){
 	if [[ -d "$1" ]]; then
 		export PATH=$1:$PATH

shell/vars.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+
 export EDITOR=vim
 export VISUAL=vim
 export BROWSER=firefox