fix addVertex and add a test case

git-svn-id: https://hyracks.googlecode.com/svn/branches/fullstack_release_cleanup@3089 123451ca-8445-de46-9d55-352943316053
diff --git a/pregelix/pregelix-example/src/test/resources/expected/GraphMutation.result b/pregelix/pregelix-example/src/test/resources/expected/GraphMutation.result
new file mode 100644
index 0000000..3f2fd60
--- /dev/null
+++ b/pregelix/pregelix-example/src/test/resources/expected/GraphMutation.result
@@ -0,0 +1,19 @@
+1 0.0
+3 0.0
+5 0.0
+7 0.0
+9 0.0
+11 0.0
+13 0.0
+15 0.0
+17 0.0
+19 0.0
+100 0.0
+300 0.0
+500 0.0
+700 0.0
+900 0.0
+1100 0.0
+1300 0.0
+1500 0.0
+1700 0.0