Store relative URI in Buffer serializer. Fixes #48.

Apply clang-format.
Add simple saver sample.

examples/saver/Makefile.dev

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+all:
+	clang++ -std=c++11 -I../../ -g -O1 -o saver main.cc

examples/saver/README.md

@@ -0,0 +1 @@
+# Simple serialization API sample.

examples/saver/main.cc

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+#include <fstream>
+#include <iostream>
+
+#define TINYGLTF_IMPLEMENTATION
+#define STB_IMAGE_IMPLEMENTATION
+#include "tiny_gltf.h"
+
+int main(int argc, char *argv[])
+{
+	if (argc != 3) {
+    std::cout << "Needs input.gltf output.gltf" << std::endl;
+    return EXIT_FAILURE;
+  }
+
+  tinygltf::Model model;
+  tinygltf::TinyGLTF loader;
+  std::string err;
+  std::string input_filename(argv[1]);
+  std::string output_filename(argv[2]);
+
+  // assume ascii glTF.
+  bool ret = loader.LoadASCIIFromFile(&model, &err, input_filename.c_str());
+  if (!ret) {
+    if (!err.empty()) {
+      std::cerr << err << std::endl;
+    }
+    return EXIT_FAILURE;
+  }
+  loader.WriteGltfSceneToFile(&model, output_filename);
+
+  return EXIT_SUCCESS;
+
+}