Added bash 4.2

installers/bash-4.2.sh

+#!/bin/bash
+
+export BASH_VERSION=4.2
+sudo apt-get install flex bison
+cd $HOME/opt/src
+wget http://ftp.gnu.org/gnu/bash/bash-${BASH_VERSION}.tar.gz
+tar zxvf bash-${BASH_VERSION}.tar.gz
+cd bash-${BASH_VERSION}
+export PREFIX=$HOME/opt/bash-${BASH_VERSION}
+./configure --prefix=$PREFIX                                 \
+            --bindir=$PREFIX/bin                             \
+            --htmldir=$PREFIX/share/doc/bash-${BASH_VERSION} \
+            --without-bash-malloc                            \
+            --with-installed-readline
+NUM_PROC=`grep processor /proc/cpuinfo  | wc -l`
+NUM_JOBS=`echo $NUM_PROC - 1 | bc`
+make -j $NUM_JOBS install