GIRAPH-692
GIRAPH-692
GIRAPH-740
GIRAPH-739
GIRAPH-734
GIRAPH-735
GIRAPH-736: Bring back FindBugs (nitay)
GIRAPH-512: JavaDoc warnings (tdn120 via nitay)
GIRAPH-732
Merge remote-tracking branch 'upstream/trunk' into GIRAPH-723

Conflicts:
	giraph-core/src/main/java/org/apache/giraph/io/EdgeWriter.java
	giraph-core/src/main/java/org/apache/giraph/io/formats/SrcIdDstIdEdgeValueTextOutputFormat.java
	giraph-core/src/main/java/org/apache/giraph/io/formats/TextEdgeOutputFormat.java
	giraph-core/src/main/java/org/apache/giraph/io/internal/WrappedEdgeOutputFormat.java
	giraph-core/src/main/java/org/apache/giraph/worker/BspServiceWorker.java
	giraph-core/src/test/java/org/apache/giraph/io/TestSrcIdDstIdEdgeValueTextOutputFormat.java
	giraph-rexster/src/main/java/org/apache/giraph/rexster/utils/RexsterUtils.java