Add beep script

This script evaluates the commands specified on the command line and
sends a beep to the terminal after the command completes execution. In
tmux, this results in the window status bar displaying the beep signal.

beep

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+if [[ $# -gt 0 ]]
+then
+    eval "$*"
+    echo -e "\007"
+fi
+