Vendor GYP and libuv into the repo.

Instead of dynamically downloading these as needed during a build, this
checks in those two dependencies directly into the Wren repo. That's a
little lame because users of Wren who aren't building the CLI don't
actually need them, but they aren't too big, so it's not a huge deal.

It makes builds (particularly on Travis) more reliable, because they
don't have to pull down additional content over the network.

deps/libuv/build/gyp/gyp.bat

@@ -0,0 +1,5 @@
+@rem Copyright (c) 2009 Google Inc. All rights reserved.
+@rem Use of this source code is governed by a BSD-style license that can be
+@rem found in the LICENSE file.
+
+@python "%~dp0gyp_main.py" %*