Move dircache, oauthutil, rest and pacer modules into lib

lib/rest/url.go

@@ -0,0 +1,27 @@
+package rest
+
+import (
+	"net/url"
+
+	"github.com/pkg/errors"
+)
+
+// URLJoin joins a URL and a path returning a new URL
+//
+// path should be URL escaped
+func URLJoin(base *url.URL, path string) (*url.URL, error) {
+	rel, err := url.Parse(path)
+	if err != nil {
+		return nil, errors.Wrapf(err, "Error parsing %q as URL", path)
+	}
+	return base.ResolveReference(rel), nil
+}
+
+// URLPathEscape escapes URL path the in string using URL escaping rules
+//
+// This mimics url.PathEscape which only available from go 1.8
+func URLPathEscape(in string) string {
+	var u url.URL
+	u.Path = in
+	return u.String()
+}