Generate single coverprofile for all hummingbird pkgs
Generate single coverprofile for all hummingbird pkgs

by using https://github.com/haya14busa/goverage.
Update travis to use this new coverage.out

creiht/hummingbird,redbo/hummingbird,troubling/hummingbird,corystone/hummingbird,troubling/hummingbird,nadeemsyed/hummingbird,redbo/hummingbird,nadeemsyed/hummingbird,corystone/hummingbird,creiht/hummingbird