Initialized ImportingJob.lastTouched

Prevents the CleaningTimerTask from disposing newly created
ImportingJobs which have not yet been touched.

main/src/com/google/refine/importing/ImportingJob.java

@@ -76,6 +76,8 @@ public class ImportingJob implements Jsonizable {
         JSONUtilities.safePut(cfg, "hasData", false);
         this.config = cfg;
         
+        lastTouched = System.currentTimeMillis();
+        
         dir.mkdirs();
     }