el5 needs rsyslog5

rsyslog v3 is too old for many of the features in this module
Merge pull request #45 from janorn/master

Made modules in rsyslog.conf configurable via parameter $modules.
Merge pull request #44 from adamcstephens/el5

el5 needs rsyslog5
remove trailing comma
add initial gentoo support
update module version to 2.1.0
fix rsyslog default config file
fix run_user and run_group
update module to version 2.2.0