Support big vertex in Pregelix.
--For those vertice beyond page size, we store them on HDFS as immutable files.
--Updates on those big vertice will trigger creations of new immutable files.

Change-Id: I6b6f0528b6b5360c96dcdace1fa360d42c517f22
Reviewed-on: http://fulliautomatix.ics.uci.edu:8443/72
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Pouria Pirzadeh <pouria.pirzadeh@gmail.com>
diff --git a/pregelix/pregelix-example/src/test/resources/expected/skew/part-2 b/pregelix/pregelix-example/src/test/resources/expected/skew/part-2
new file mode 100755
index 0000000..c21220f
--- /dev/null
+++ b/pregelix/pregelix-example/src/test/resources/expected/skew/part-2
@@ -0,0 +1,5 @@
+3	0.07941505736441216
+7	0.011947009713572225
+11	0.1561028584551254
+15	0.022550744820502584
+19	0.013158324980956872