Add github.com/rackspace/gophercloud package as a dependency.

Note this also pulls in:
github.com/kr/text
github.com/mitchellh/mapstructure
github.com/racker/perigee
github.com/tonnerre/golang-pretty

Godeps/_workspace/src/github.com/rackspace/gophercloud/reauth.go

@@ -0,0 +1,36 @@
+package gophercloud
+
+import (
+	"github.com/racker/perigee"
+)
+
+// WithReauth wraps a Perigee request fragment with logic to perform re-authentication
+// if it's deemed necessary.
+//
+// Do not confuse this function with WithReauth()!  Although they work together to support reauthentication,
+// WithReauth() actually contains the decision-making logic to determine when to perform a reauth,
+// while WithReauthHandler() is used to configure what a reauth actually entails.
+func (c *Context) WithReauth(ap AccessProvider, f func() error) error {
+	err := f()
+	cause, ok := err.(*perigee.UnexpectedResponseCodeError)
+	if ok && cause.Actual == 401 {
+		err = c.reauthHandler(ap)
+		if err == nil {
+			err = f()
+		}
+	}
+	return err
+}
+
+// This is like WithReauth above but returns a perigee Response object
+func (c *Context) ResponseWithReauth(ap AccessProvider, f func() (*perigee.Response, error)) (*perigee.Response, error) {
+	response, err := f()
+	cause, ok := err.(*perigee.UnexpectedResponseCodeError)
+	if ok && cause.Actual == 401 {
+		err = c.reauthHandler(ap)
+		if err == nil {
+			response, err = f()
+		}
+	}
+	return response, err
+}