Update doc to install on CentOS
yum groupinstall "Development Tools"
yum install gcc gcc-c++zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel
wget "https://www.python.org/ftp/python/2.7.11/Python-2.7.11.tgz" && tar zxvf Python-2.7.11.tgz && cd Python-2.7.11
./configure --prefix=/usr --enable-shared && make && make altinstall
ln -s /usr/lib/libpython2.7.so.1.0 /usr/lib64/libpython2.7.so.1.0
wget https://bitbucket.org/pypa/setuptools/raw/bootstrap/ez_setup.py
python2.7 ez_setup.py
easy_install-2.7 pip
easy_install-2.7 babel
easy_install-2.7 jinja2
easy_install-2.7 cherrypy
easy_install-2.7 pysqlite
cd rdiffweb-master/ && python setup.py install