Switch to using the dep tool and update all the dependencies

vendor/google.golang.org/api/Makefile

@@ -0,0 +1,27 @@
+API_JSON = $(wildcard */*/*-api.json */*/*/*-api.json)
+
+# Download all API specifications and rebuild Go bindings.
+# All downloaded files are cached in $TMPDIR for reuse with 'cached' below.
+all: generator
+	$(GOPATH)/bin/google-api-go-generator -cache=false -install -api=*
+
+# Reuse cached API specifications in $TMPDIR and rebuild Go bindings.
+cached: generator
+	$(GOPATH)/bin/google-api-go-generator -cache=true -install -api=*
+
+# Only rebuild Go bindings, do not modify API specifications.
+# For every existing */*/*-api.json file, */*/*-gen.go will be built.
+local: $(API_JSON:-api.json=-gen.go)
+
+# Pattern rule for the 'local' target.
+# Translates otherwise unnamed targets with a -gen.go suffix into the
+# matching input file with a -api.json suffix. $< is the input file.
+%-gen.go: %-api.json generator
+	$(GOPATH)/bin/google-api-go-generator -api_json_file=$<
+
+# Rebuild and install $(GOPATH)/bin/google-api-go-generator
+generator:
+	go install google.golang.org/api/googleapi
+	go install google.golang.org/api/google-api-go-generator
+
+.PHONY: all cached local generator