update some dependencies (#208)

* update some dependencies

* some more

* add these

* remove things?

* regen

vendor/google.golang.org/appengine/internal/api_common.go

@@ -5,12 +5,15 @@
 package internal
 
 import (
+	"errors"
 	"os"
 
 	"github.com/golang/protobuf/proto"
 	netcontext "golang.org/x/net/context"
 )
 
+var errNotAppEngineContext = errors.New("not an App Engine context")
+
 type CallOverrideFunc func(ctx netcontext.Context, service, method string, in, out proto.Message) error
 
 var callOverrideKey = "holds []CallOverrideFunc"
@@ -79,7 +82,11 @@ func Logf(ctx netcontext.Context, level int64, format string, args ...interface{
 		f(level, format, args...)
 		return
 	}
-	logf(fromContext(ctx), level, format, args...)
+	c := fromContext(ctx)
+	if c == nil {
+		panic(errNotAppEngineContext)
+	}
+	logf(c, level, format, args...)
 }
 
 // NamespacedContext wraps a Context to support namespaces.