update nuspec files

src/csharp/Grpc.Auth/Grpc.Auth.nuspec

@@ -7,7 +7,7 @@
     <description>Auth library for C# implementation of gRPC - an RPC library and framework. See project site for more info.</description>
     <version>0.5.0</version>
     <authors>Google Inc.</authors>
-    <owners>jtattermusch</owners>
+    <owners>grpc-packages</owners>
     <licenseUrl>https://github.com/grpc/grpc/blob/master/LICENSE</licenseUrl>
     <projectUrl>https://github.com/grpc/grpc</projectUrl>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>

src/csharp/Grpc.Core/Grpc.Core.nuspec

@@ -7,7 +7,7 @@
     <description>Core C# implementation of gRPC - an RPC library and framework. See project site for more info.</description>
     <version>0.5.0</version>
     <authors>Google Inc.</authors>
-    <owners>jtattermusch</owners>
+    <owners>grpc-packages</owners>
     <licenseUrl>https://github.com/grpc/grpc/blob/master/LICENSE</licenseUrl>
     <projectUrl>https://github.com/grpc/grpc</projectUrl>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>

src/csharp/Grpc.nuspec

@@ -7,7 +7,7 @@
     <description>C# implementation of gRPC - an RPC library and framework. See project site for more info.</description>
     <version>0.5.0</version>
     <authors>Google Inc.</authors>
-    <owners>jtattermusch</owners>
+    <owners>grpc-packages</owners>
     <licenseUrl>https://github.com/grpc/grpc/blob/master/LICENSE</licenseUrl>
     <projectUrl>https://github.com/grpc/grpc</projectUrl>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
@@ -18,5 +18,8 @@
       <dependency id="Grpc.Core" version="0.5.0" />
     </dependencies>
   </metadata>
-  <files/>
+  <files>
+     <file src="protoc.exe" target="tools" />
+	 <file src="grpc_csharp_plugin.exe" target="tools" />
+  </files>
 </package>

vsprojects/nuget_package/grpc.native.csharp_ext.nuspec

@@ -4,7 +4,7 @@
     <id>grpc.native.csharp_ext</id>
     <version>0.9.0.0</version>
     <authors>Google Inc.</authors>
-    <owners>Jan Tattermusch</owners>
+    <owners>grpc-packages</owners>
     <licenseUrl>https://github.com/grpc/grpc/blob/master/LICENSE</licenseUrl>
     <projectUrl>http://github.com/grpc/grpc</projectUrl>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>