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-3 b/pregelix/pregelix-example/src/test/resources/expected/skew/part-3
new file mode 100755
index 0000000..39a8af1
--- /dev/null
+++ b/pregelix/pregelix-example/src/test/resources/expected/skew/part-3
@@ -0,0 +1,6 @@
+0	0.008261482871440377
+4	0.038415704685818675
+8	0.010122315837328184
+12	0.15141534420136182
+16	0.015706612612729605
+412454	0.007142857142857143