CBLT-42:  fix typo in File.exists?
CBLT-42:  fix typo in File.exists?

Change-Id: I9d3108420f5599aafb14a93921edc11aa5511689

ceejatec/sync_gateway,tophatch/sync_gateway,jamiltz/sync_gateway,tophatch/sync_gateway,tleyden/sync_gateway,evankyle/sync_gateway,tleyden/sync_gateway,evankyle/sync_gateway,evankyle/sync_gateway,evankyle/sync_gateway,ceejatec/sync_gateway,tleyden/sync_gateway,tophatch/sync_gateway,paulharter/sync_gateway,ceejatec/sync_gateway,paulharter/sync_gateway,jamiltz/sync_gateway,couchbaselabs/sync_gateway,couchbaselabs/sync_gateway,couchbaselabs/sync_gateway,tleyden/sync_gateway,jamiltz/sync_gateway,ceejatec/sync_gateway,paulharter/sync_gateway,couchbaselabs/sync_gateway,tophatch/sync_gateway,paulharter/sync_gateway