added basic pom.xml for maven
 first attempt to download jreality automatically and to create a maven repo out of the jar files
 use ant as pre-builder for local maven repo and added a bash script to add the jReality jar files to the local maven repo
added compile-polymake to ant, this task will download polymake 2.12, deflates it, configure it and finally build it into lib/polymake
 use setup task in ant build script to set up the local maven repo for jReality files
 wrote a little introduction to "how to compile the project"
 updated .gitignore, ignore the lib/ folder
 updated pom.xml file to reflect more enforced coding styles
 corrected line-ending of point-groups-coding-style.xml
local maven repo: removed readlink because it does not work on mac
Merge branch 'maven-integration'