remove soft dep on TZInfo (Thanks anyway Bryan)
remove soft dep on TZInfo (Thanks anyway Bryan)

for gh-169

railsfactory-kumaresan/rufus-scheduler,moritoru81/rufus-scheduler,kssminus/rufus-scheduler,shutl/rufus-scheduler,safesoftware/rufus-scheduler,jmettraux/rufus-scheduler,AndBicScadMedia/rufus-scheduler