[gh-50] Build fixes.

appveyor.yml

@@ -13,6 +13,9 @@ test_script:
 after_build:
 - ps: .\dotnet-pack-all.bat
 
+artifacts:
+- path: '*.nupkg'
+
 deploy:
   - provider: NuGet
     on:

dotnet-pack-all.bat

@@ -1,2 +1,2 @@
 @echo off
-powershell "$version = 'pre-'+([DateTime]::Now.ToString('yyyyMMdd'))+'%1'; @('MirrorSharp.Common', 'MirrorSharp.Owin') | %% { dotnet pack $_ --version-suffix=$version --output . }"
+powershell "$version = 'pre-'+([DateTime]::Now.ToString('yyyyMMdd'))+'%1'; @('MirrorSharp.Common', 'MirrorSharp.Owin') | %% { dotnet pack $_ --version-suffix=$version --output . --configuration Release }"