Only require system_timer on Ruby 1.8
Only require system_timer on Ruby 1.8

square/rubygems.org,dstrctrng/private_event,rubygems/rubygems.org-backup,1337807/rubygems.org,square/rubygems.org,1337807/rubygems.org,bpm/getbpm.org,bpm/getbpm.org,dstrctrng/private_event,square/rubygems.org,rubygems/rubygems.org-backup,1337807/rubygems.org,rubygems/rubygems.org-backup