clean up ${logstash::installpath} when updating jars
remove installpath when ensure => absent
remove brackets
Merge pull request #73 from jlambert121/issue_42_absent_cleanup

remove installpath when ensure => absent
add ability to purge old jars
Merge pull request #72 from jlambert121/issue_42_rem_jars

clean up ${logstash::installpath} when updating jars