persist its messages automatically when persisting a source

--HG--
extra : rebase_source : 530047d957db6392f3db5a308aa221855dc46ee1

modules/source.js

@@ -316,6 +316,8 @@ this._log.info("persist placeID:sources.id - " + placeID + " : " + this.id);
         Observers.notify("snowl:source:added", placeID);
       }
 
+      this.persistMessages();
+
       SnowlDatastore.dbConnection.commitTransaction();
     }
     catch(ex) {

test/unit/test_feed.js

@@ -29,7 +29,6 @@ function run_test() {
 
 function finish_test() {
   feed.persist();
-  feed.persistMessages();
 
   try {
     do_check_eq(SnowlService.accounts.length, 1);