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-0 b/pregelix/pregelix-example/src/test/resources/expected/skew/part-0
new file mode 100755
index 0000000..c2c0cc0
--- /dev/null
+++ b/pregelix/pregelix-example/src/test/resources/expected/skew/part-0
@@ -0,0 +1,6 @@
+1	0.1538057869748262
+5	0.021540394083972653
+9	0.008851770565007962
+13	0.08308297649373161
+17	0.012504121497877515
+21	0.009166666666666667
diff --git a/pregelix/pregelix-example/src/test/resources/expected/skew/part-1 b/pregelix/pregelix-example/src/test/resources/expected/skew/part-1
new file mode 100755
index 0000000..5a792e7
--- /dev/null
+++ b/pregelix/pregelix-example/src/test/resources/expected/skew/part-1
@@ -0,0 +1,6 @@
+2	0.14475932277139475
+6	0.015003751200304748
+10	0.0078953714534803
+14	0.040205598595470717
+18	0.010592752407987198
+22	0.007142857142857143
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
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