Problem CI 1.5 is ProblemCI rewritten in Golang, it is almost compatible with the old ProblemCI.
To build ProblemCI 1.5 (Judger):
$ dep ensure
$ cd cmd/pci15/judger
$ go build
To build ProblemCI 1.5 (Problem Builder):
$ dep ensure
$ cd cmd/pci15/builder
$ go build
TODO