Implement isStartSeed
Add normalMean and normalStd to conf
Merge remote-tracking branch 'origin/anbangx/implement-is-start-seed' into wbiesing/ray-works-on-partially-merged-graph

Conflicts:
	genomix/genomix-
data/src/main/java/edu/uci/ics/genomix/data/config/GenomixJobConf.java
	genomix/genomix-
driver/src/main/java/edu/uci/ics/genomix/driver/GenomixDriver.java
	genomix/genomix-
pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/scaffolding2/RayVertex.java