GIRAPH-927: Decouple netty server threads from message processing (edunov via pavanka)
GIRAPH-932 - Adding .arcconfig to GIRAPH for Arcanist support

Summary: As above

Test Plan: This diff.

Reviewers: maja.kabiljo

Reviewed By: maja.kabiljo

Subscribers: maja.kabiljo

Differential Revision: https://reviews.facebook.net/D20439
GIRAPH-934: Allow having state in aggregators (ikabiljo via majakabiljo)
GIRAPH-936: AsyncMessageStoreWrapper threads are not daemonized (edunov via majakabiljo)
Fix GIRAPH-934
Fix GIRAPH-934
GIRAPH-893: Implement preLoad & postSave on workerObservers (pavanka)
GIRAPH-937 - Upgrade Hive I/O to 0.26

Summary: As above

Test Plan: mvn compile

Reviewers: maja.kabiljo

Reviewed By: maja.kabiljo

Differential Revision: https://reviews.facebook.net/D21237
GIRAPH-935: Loosen modifiers when needed (ikabiljo via majakabiljo)
GIRAPH-888. Please create a DOAP file for your TLP
GIRAPH-943: Perf regression due to netty 4.0.21 (pavanka)
Merge remote-tracking branch 'upstream/trunk' into trunk