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/DEPS

@@ -0,0 +1,23 @@
+# DEPS file for gclient use in buildbot execution of gyp tests.
+#
+# (You don't need to use gclient for normal GYP development work.)
+
+vars = {
+  "chromium_git": "https://chromium.googlesource.com/",
+}
+
+deps = {
+}
+
+deps_os = {
+  "win": {
+    "third_party/cygwin":
+      Var("chromium_git") + "chromium/deps/cygwin@4fbd5b9",
+
+    "third_party/python_26":
+      Var("chromium_git") + "chromium/deps/python_26@5bb4080",
+
+    "src/third_party/pefile":
+       Var("chromium_git") + "external/pefile@72c6ae4",
+  },
+}