1、标注Unity平台的LuaExportsTypeAnnotation过时，新增LuaExclude标识。

2、修复Unity平台下数据转换报错崩溃问题

Author: vimfung

Source/Unity3D/UnityProject/Assets/Plugins/LuaScriptCore/LuaExclude.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace cn.vimfung.luascriptcore
+{
+	/// <summary>
+	/// 用于排除C#类型导出到Lua的属性、方法
+	/// </summary>
+	[AttributeUsage(AttributeTargets.All)]
+	public class LuaExclude : Attribute
+	{
+		
+	}
+}
+

Source/Unity3D/UnityProject/Assets/Plugins/LuaScriptCore/LuaExclude.cs.meta

@@ -2,6 +2,7 @@
 
 namespace cn.vimfung.luascriptcore
 {
+	[Obsolete("Use LuaExclude attribute instead.")]
 	[AttributeUsage(AttributeTargets.Class)]
 	public class LuaExportTypeAnnotation : Attribute
 	{

Source/Unity3D/UnityProject/Assets/Plugins/LuaScriptCore/LuaExportTypeAnnotation.cs

@@ -168,6 +168,13 @@ public void exportType(Type t, LuaContext context)
 
 					string methodName = string.Format ("{0}_{1}", m.Name, methodSignature.ToString ());
 
+					LuaExclude isExclude = Attribute.GetCustomAttribute (m, typeof(LuaExclude), true) as LuaExclude;
+					if (isExclude != null)
+					{
+						//为过滤方法
+						continue;
+					}
+
 					if (m.IsStatic && m.IsPublic)
 					{
 						if (typeAnnotation != null
@@ -206,6 +213,13 @@ public void exportType(Type t, LuaContext context)
 			PropertyInfo[] propertys = t.GetProperties (BindingFlags.Instance | BindingFlags.Public);
 			foreach (PropertyInfo p in propertys) 
 			{
+				LuaExclude isExclude = Attribute.GetCustomAttribute (p, typeof(LuaExclude), true) as LuaExclude;
+				if (isExclude != null)
+				{
+					//为过滤方法
+					continue;
+				}
+
 				if (typeAnnotation != null 
 					&& typeAnnotation.excludeExportPropertyNames != null 
 					&& Array.IndexOf (typeAnnotation.excludeExportPropertyNames, p.Name) >= 0)

Source/Unity3D/UnityProject/Assets/Plugins/LuaScriptCore/LuaExportsTypeManager.cs

@@ -445,7 +445,14 @@ public LuaValue (LuaObjectDecoder decoder)
 		/// <returns>整型值</returns>
 		public int toInteger()
 		{
-			return Convert.ToInt32 (_value);
+			try
+			{
+				return Convert.ToInt32 (_value);
+			}
+			catch(FormatException ex)
+			{
+				return 0;
+			}
 		}
 
 		/// <summary>
@@ -454,7 +461,14 @@ public int toInteger()
 		/// <returns>布尔值</returns>
 		public bool toBoolean()
 		{
-			return Convert.ToBoolean (_value);
+			try
+			{
+				return Convert.ToBoolean (_value);
+			}
+			catch (FormatException ex)
+			{
+				return false;
+			}
 		}
 
 		/// <summary>
@@ -463,7 +477,15 @@ public bool toBoolean()
 		/// <returns>双精度浮点值</returns>
 		public double toNumber()
 		{
-			return Convert.ToDouble (_value);
+			try
+			{
+				return Convert.ToDouble (_value);
+			}
+			catch (FormatException ex)
+			{
+				return 0.0;
+			}
+
 		}
 
 		/// <summary>
@@ -472,17 +494,24 @@ public double toNumber()
 		/// <returns>二进制数据流</returns>
 		public byte[] toData()
 		{
-			switch (_type) 
+			try
+			{
+				switch (_type) 
+				{
+				case LuaValueType.Integer:
+					return BitConverter.GetBytes (Convert.ToInt32 (_value));
+				case LuaValueType.Number:
+					return BitConverter.GetBytes (Convert.ToDouble(_value));
+				case LuaValueType.String:
+					return Encoding.UTF8.GetBytes (Convert.ToString(_value));
+				case LuaValueType.Data:
+					return (byte[])_value;
+				default:
+					return null;
+				}
+			}
+			catch (FormatException ex)
 			{
-			case LuaValueType.Integer:
-				return BitConverter.GetBytes (Convert.ToInt32 (_value));
-			case LuaValueType.Number:
-				return BitConverter.GetBytes (Convert.ToDouble(_value));
-			case LuaValueType.String:
-				return Encoding.UTF8.GetBytes (Convert.ToString(_value));
-			case LuaValueType.Data:
-				return (byte[])_value;
-			default:
 				return null;
 			}
 		}
@@ -493,7 +522,14 @@ public byte[] toData()
 		/// <returns>字符串</returns>
 		public string toString()
 		{
-			return Convert.ToString (_value);
+			try
+			{
+				return Convert.ToString (_value);
+			}
+			catch (FormatException ex)
+			{
+				return null;
+			}
 		}
 
 		/// <summary>