Check for race conditions and fail test build if they exist

Author: jacobmoss-wf

.travis.yml

@@ -6,7 +6,9 @@ go:
   - tip
 
 before_install: go get golang.org/x/tools/cmd/cover
-script: go test -race -cover ./...
+script: 
+  - export GORACE="halt_on_error=1"
+  - go test -race -v -cover ./...
 
 env:
 - GOMAXPROCS=8