Merge pull request #481 from jtattermusch/csharp_win_dll

...tes/vsprojects/vs2013/gpr_shared.vcxproj.filters.template

templates/vsprojects/vs2013/gpr_shared.vcxproj.template

templates/vsprojects/vs2013/grpc.sln.template

...vsprojects/vs2013/grpc_csharp_ext_shared.vcxproj.template

...es/vsprojects/vs2013/grpc_shared.vcxproj.filters.template

templates/vsprojects/vs2013/grpc_shared.vcxproj.template

templates/vsprojects/vs2013/vcxproj_defs.include

vsprojects/vs2013/gpr.vcxproj

vsprojects/vs2013/gpr_shared.vcxproj

vsprojects/vs2013/gpr_shared.vcxproj.filters

vsprojects/vs2013/gpr_test_util.vcxproj

vsprojects/vs2013/grpc.sln

vsprojects/vs2013/grpc.vcxproj

vsprojects/vs2013/grpc_csharp_ext.vcxproj

vsprojects/vs2013/grpc_csharp_ext_shared.vcxproj

vsprojects/vs2013/grpc_shared.vcxproj

vsprojects/vs2013/grpc_shared.vcxproj.filters

vsprojects/vs2013/grpc_test_util.vcxproj

vsprojects/vs2013/grpc_unsecure.vcxproj

vsprojects/vs2013/third_party/zlibvc.vcxproj