Add DD support (#1596)

Gopkg.lock

@@ -1,6 +1,16 @@
 # This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
 
 
+[[projects]]
+  name = "github.com/DataDog/dd-trace-go"
+  packages = [
+    "opentracing",
+    "tracer",
+    "tracer/ext"
+  ]
+  revision = "27617015d45e6cd550b9a7ac7715c37cc2f7d020"
+  version = "v0.6.1"
+
 [[projects]]
   name = "github.com/PuerkitoBio/purell"
   packages = ["."]
@@ -378,8 +388,7 @@
 [[projects]]
   name = "github.com/ugorji/go"
   packages = ["codec"]
-  revision = "9831f2c3ac1068a78f50999a30db84270f647af6"
-  version = "v1.1"
+  revision = "9c7f9b7a2bc3a520f7c7b30b34b7f85f47fe27b6"
 
 [[projects]]
   name = "github.com/v2pro/plz"
@@ -596,6 +605,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "e302488e45c3f12eae09558fb7c71cf495826866cb5b764745c10fffcb325537"
+  inputs-digest = "34ebe11afea36c4e0094c66da89498960a8bc8fadea034bffb24bcb935cdb37e"
   solver-name = "gps-cdcl"
   solver-version = 1