Add base image for CentOS7

CentOS7

+FROM centos:7.4.1708
+ MAINTAINER Tamas Gal <tgal@km3net.de>
+
+ RUN yum install -y git subversion wget && yum clean -y all
+ RUN yum install -y ant bison flex-devel gcc gcc-c++ gcc-gfortran gdb make cmake glibc-static && yum clean -y all
+ RUN yum install -y doxygen && yum clean -y all