Merge branch 'master' into release/v1.0.6

.travis.yml

conn/node.go

contrib/integration/acctupsert/main.go

contrib/integration/bank/main.go

contrib/integration/mutates/main.go

contrib/integration/swap/main.go

contrib/nightly/build-cross-platform.sh

contrib/nightly/constants.sh

contrib/release.sh

contrib/scripts/README.txt

contrib/scripts/functions.sh

contrib/scripts/goldendata-queries.sh

contrib/scripts/load-test.sh

contrib/scripts/loader.sh

contrib/scripts/transactions.sh

contrib/wait-for-it.sh

dgraph/cmd/root.go

dgraph/cmd/server/http_test.go

dgraph/cmd/server/run.go

dgraph/cmd/server/run_test.go