Updated script/{web,background_job} to use #!/usr/bin/env bash rather than...

Updated script/{web,background_job} to use #!/usr/bin/env bash rather than #!/bin/bash to allow for transparency between OS namely Linux and FreeBSD and for source installs of bash where path is not exported by default for /usr/local/{bin,sbin}

script/background_jobs

-#!/bin/bash
+#!/usr/bin/env bash
 
 cd $(dirname $0)/..
 app_root=$(pwd)

script/web

-#!/bin/bash
+#!/usr/bin/env bash
 
 cd $(dirname $0)/..
 app_root=$(pwd)