Merge pull request #997 from neuecc/unity-package

Add packagejson and enable .meta for Unity

.gitignore

@@ -45,7 +45,6 @@ dlldata.c
 *_p.c
 *_i.h
 *.ilk
-*.meta
 *.obj
 *.pch
 *.pdb

src/MessagePack.UnityClient/Assets/Scripts/Editor/PackageExporter.cs

@@ -18,7 +18,7 @@ public static void Export()
 
         var path = Path.Combine(Application.dataPath, root);
         var assets = Directory.EnumerateFiles(path, "*", SearchOption.AllDirectories)
-            .Where(x => Path.GetExtension(x) == ".cs" || Path.GetExtension(x) == ".meta" || Path.GetExtension(x) == ".asmdef")
+            .Where(x => Path.GetExtension(x) == ".cs" || Path.GetExtension(x) == ".meta" || Path.GetExtension(x) == ".asmdef" || Path.GetExtension(x) == ".json")
             .Where(x => Path.GetFileNameWithoutExtension(x) != "_InternalVisibleTo")
             .Select(x => "Assets" + x.Replace(Application.dataPath, "").Replace(@"\", "/"))
             .ToArray();