Parse ior and transmittance of material parameter.

Add .obj sticher example.

examples/obj_sticher/premake4.lua

@@ -0,0 +1,38 @@
+lib_sources = {
+   "../../tiny_obj_loader.cc"
+}
+
+sources = {
+   "obj_sticher.cc",
+   "obj_writer.cc",
+   }
+
+-- premake4.lua
+solution "ObjStickerSolution"
+   configurations { "Release", "Debug" }
+
+   if (os.is("windows")) then
+      platforms { "x32", "x64" }
+   else
+      platforms { "native", "x32", "x64" }
+   end
+
+   includedirs {
+      "../../"
+   }
+
+   -- A project defines one build target
+   project "obj_sticher"
+      kind "ConsoleApp"
+      language "C++"
+      files { lib_sources, sources }
+
+      configuration "Debug"
+         defines { "DEBUG" } -- -DDEBUG
+         flags { "Symbols" }
+         targetname "obj_sticher_debug"
+
+      configuration "Release"
+         -- defines { "NDEBUG" } -- -NDEBUG
+         flags { "Symbols", "Optimize" }
+         targetname "obj_sticher"