install_barkeep.sh: combine apt-get commands.

install_barkeep.sh

@@ -15,12 +15,7 @@ set -e
 # Install core dependencies
 sudo apt-get update
 sudo DEBIAN_FRONTEND=noninteractive apt-get install -y g++ build-essential libxslt1-dev libxml2-dev \
-  python-dev libmysqlclient-dev redis-server mysql-server nginx
-
-# Install git 1.7.6+
-sudo apt-get -y install python-software-properties
-sudo add-apt-repository -y ppa:git-core/ppa && sudo apt-get update
-sudo apt-get install -y git
+  python-dev libmysqlclient-dev redis-server mysql-server nginx git
 
 # Install ruby 1.9.3-p194
 git clone git://github.com/sstephenson/rbenv.git ~/.rbenv