Don't set SKIP_EXISTING if specified in fresh_sync

Author: iloveitaly

lib/netsuite_rails/tasks/netsuite.rb

@@ -27,7 +27,9 @@ def generate_options
   task :fresh_sync => :environment do
     NetSuiteRails::PollTimestamp.delete_all
 
-    ENV['SKIP_EXISTING'] = "true"
+    if ENV['SKIP_EXISTING'].blank?
+      ENV['SKIP_EXISTING'] = "true"
+    end
 
     Rake::Task["netsuite:sync"].invoke
   end