Inherit sumo::params instead of including the class
Append ${sumo::install_script_dir} to qualify ${sumo::install_script}
Add "-dir ${sumo::install_dir}" to sumo install command
Merge pull request #1 from brandonweeks/master

Reverting to Inherit sumo::params instead of including the class (Puppet 2.6.2 is 4 years old now)