Set default SELinux values to the custom init script

Allow to change them.
Adapt tomcat module for CentOS
Use osfamily to improve cases
Merge pull request #32 from raphink/centos

Adapt tomcat module for CentOS
Move doc to Markdown, add Modulefile, Add LICENSE
Fix $javahome for CentOS
lsbmajdistrelease fact is not set in CentOS, use operatingsystemrelease
Merge pull request #33 from carlossg/centos

lsbmajdistrelease fact is not set in CentOS, use operatingsystemrelease
Merged with new version