Add AssemblyNativeVersionAttribute (#67)

***NO_CI***

Author: josesimoes

source/nanoFramework.CoreLibrary/CoreLibrary.nfproj

@@ -313,6 +313,9 @@
     <NFMDP_PE_ExcludeClassByName Include="System.Reflection.AssemblyVersionAttribute">
       <InProject>false</InProject>
     </NFMDP_PE_ExcludeClassByName>
+    <NFMDP_PE_ExcludeClassByName Include="System.Reflection.AssemblyNativeVersionAttribute">
+      <InProject>false</InProject>
+    </NFMDP_PE_ExcludeClassByName>
     <NFMDP_PE_ExcludeClassByName Include="System.Reflection.DefaultMemberAttribute">
       <InProject>false</InProject>
     </NFMDP_PE_ExcludeClassByName>

source/nanoFramework.CoreLibrary/System/AssemblyInfo2.cs

@@ -6,9 +6,12 @@
 
 using System;
 using System.Reflection;
+using System.Runtime.CompilerServices;
 
 [assembly: CLSCompliant(true)]
 [assembly: AssemblyTitle("mscorlib")]
 [assembly: AssemblyCompany("nanoFramework Contributors")]
 [assembly: AssemblyProduct("nanoFramework mscorlib")]
 [assembly: AssemblyCopyright("Copyright © nanoFramework Contributors 2017")]
+
+[assembly: AssemblyNativeVersion("1.1.1.")]

source/nanoFramework.CoreLibrary/System/Reflection/AssemblyAttributes.cs

@@ -226,4 +226,37 @@ public String Version
             get { return _version; }
         }
     }
+
+    /// <summary>
+    /// Defines the required native version required for an assembly.
+    /// At deploy time this is used to check if the target device has the correct native version to support this assembly.
+    /// </summary>
+    /// <remarks>
+    /// This attribute is specific of nanoFramework.
+    /// </remarks>
+    [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class, Inherited = false)]
+    public sealed class AssemblyNativeVersionAttribute : Attribute
+    {
+        private readonly String _nativeVersion;
+
+        /// <summary>
+        /// Initializes a new instance of the AssemblyNativeVersionAttribute class.
+        /// </summary>
+        /// <param name="version">The native version required for the assembly.</param>
+        public AssemblyNativeVersionAttribute(String version)
+        {
+            _nativeVersion = version;
+        }
+
+        /// <summary>
+        /// Gets the native version required for the assembly.
+        /// </summary>
+        /// <value>
+        /// A string containing the native version.
+        /// </value>
+        public String NativeVersion
+        {
+            get { return _nativeVersion; }
+        }
+    }
 }