fix(transporter): CancelRequest doesn't work on HTTPS connections blocked

Currently this is a workaround. And it should be fixed in Go1.3.

third_party/github.com/mreiferson/go-httpclient/README.md

@@ -0,0 +1,39 @@
+## go-httpclient
+
+**requires Go 1.1+** as of `v0.4.0` the API has been completely re-written for Go 1.1 (for a Go
+1.0.x compatible release see [1adef50](https://github.com/mreiferson/go-httpclient/tree/1adef50))
+
+[![Build
+Status](https://secure.travis-ci.org/mreiferson/go-httpclient.png?branch=master)](http://travis-ci.org/mreiferson/go-httpclient)
+
+Provides an HTTP Transport that implements the `RoundTripper` interface and
+can be used as a built in replacement for the standard library's, providing:
+
+ * connection timeouts
+ * request timeouts
+
+This is a thin wrapper around `http.Transport` that sets dial timeouts and uses
+Go's internal timer scheduler to call the Go 1.1+ `CancelRequest()` API.
+
+### Example
+
+```go
+transport := &httpclient.Transport{
+    ConnectTimeout:        1*time.Second,
+    RequestTimeout:        10*time.Second,
+    ResponseHeaderTimeout: 5*time.Second,
+}
+defer transport.Close()
+
+client := &http.Client{Transport: transport}
+req, _ := http.NewRequest("GET", "http://127.0.0.1/test", nil)
+resp, err := client.Do(req)
+if err != nil {
+    return err
+}
+defer resp.Body.Close()
+```
+
+### Reference Docs
+
+For API docs see [godoc](http://godoc.org/github.com/mreiferson/go-httpclient).