setup build packages to build preview version

src/csharp/Grpc.Core/VersionInfo.cs

@@ -8,6 +8,6 @@ namespace Grpc.Core
         /// <summary>
         /// Current version of gRPC
         /// </summary>
-        public const string CurrentVersion = "0.6.0";
+        public const string CurrentVersion = "0.7.0";
     }
 }

src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.nuspec

@@ -14,7 +14,7 @@
     <copyright>Copyright 2015, Google Inc.</copyright>
     <tags>gRPC health check</tags>
 	<dependencies>
-	  <dependency id="Google.ProtocolBuffers" version="2.4.1.555" />
+	  <dependency id="Google.Protobuf" version="$ProtobufVersion$" />
 	  <dependency id="Grpc.Core" version="$version$" />
 	  <dependency id="Ix-Async" version="1.2.3" />
     </dependencies>

src/csharp/build_packages.bat

 @rem Builds gRPC NuGet packages
 
 @rem Current package versions
-set VERSION=0.6.0
-set CORE_VERSION=0.10.0
+set VERSION=0.7.0-preview20150808
+set CORE_VERSION=0.11.0-preview20150808
+set PROTOBUF_VERSION=3.0.0-a20150808-e58cdbd214
 
 @rem Adjust the location of nuget.exe
 set NUGET=C:\nuget\nuget.exe
@@ -17,7 +18,7 @@ endlocal
 %NUGET% pack ..\..\vsprojects\nuget_package\grpc.native.csharp_ext.nuspec -Version %CORE_VERSION% || goto :error
 %NUGET% pack Grpc.Auth\Grpc.Auth.nuspec -Symbols -Version %VERSION% || goto :error
 %NUGET% pack Grpc.Core\Grpc.Core.nuspec -Symbols -Version %VERSION% -Properties GrpcNativeCsharpExtVersion=%CORE_VERSION% || goto :error
-%NUGET% pack Grpc.HealthCheck\Grpc.HealthCheck.nuspec -Symbols -Version %VERSION% || goto :error
+%NUGET% pack Grpc.HealthCheck\Grpc.HealthCheck.nuspec -Symbols -Version %VERSION% -Properties ProtobufVersion=%PROTOBUF_VERSION% || goto :error
 %NUGET% pack Grpc.Tools.nuspec -Version %VERSION% || goto :error
 %NUGET% pack Grpc.nuspec -Version %VERSION% || goto :error