making build scripts use bash instead of sh (#181)

install/build_deb.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"
 cd $DIR

install/build_rpm.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"
 cd $DIR

install/ppa_release.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # This script pushes updates to my Ubuntu PPA: https://launchpad.net/~micahflee/+archive/ppa
 # If you want to use it, you'll need your own ~/.dput.cf and ssh key.