Install requirements on CentOS

yum update
yum install git
yum install python-pip
yum --enablerepo=extras install epel-release
yum install python-pip
yum install -y gcc libxml2 libxml2-devel libxslt libxslt-devel
yum install python-devel
pip install pip==8.1.1
pip install virtualenv
pip install -r requirements.txt