Appveyor build improvements

Appveyor build improvements:
- added nuget packages folder to cache to speedup build
- all unit tests are now showing up in the tests tab

appveyor.yml

@@ -17,6 +17,8 @@ skip_tags: true
 #---------------------------------#
 #    environment configuration    #
 #---------------------------------#
+cache:
+  - packages
 
 # scripts that are called at very beginning, before repo cloning
 init:
@@ -62,14 +64,14 @@ after_build:
 #---------------------------------#
 #       tests configuration       #
 #---------------------------------#
-before_test:
-  - dotnet test .\BenchmarkDotNet.Tests\project.json --configuration Release
-  - dotnet test .\BenchmarkDotNet.IntegrationTests\project.json --configuration Release
+test_script:
+  - dotnet test .\BenchmarkDotNet.Tests\project.json --configuration Release -xml tests-results01.xml
+  - ps: .\build\uploadtests.ps1 "tests-results01.xml"
+  - dotnet test .\BenchmarkDotNet.IntegrationTests\project.json --configuration Release -xml tests-results02.xml
+  - ps: .\build\uploadtests.ps1 "tests-results02.xml"
 
 test:
   assemblies:
-    - BenchmarkDotNet.Tests\bin\$(configuration)\net451\win7-x64\BenchmarkDotNet.Tests.dll
-    - BenchmarkDotNet.IntegrationTests\bin\$(configuration)\net451\win7-x64\BenchmarkDotNet.IntegrationTests.dll
     - BenchmarkDotNet.IntegrationTests.Classic\bin\$(configuration)\BenchmarkDotNet.IntegrationTests.Classic.exe
 
 artifacts:

build/uploadtests.ps1

@@ -0,0 +1,37 @@
+param(
+    [string]
+    $ResultsFile,
+
+    [string]
+    $ResultsType = "xunit"
+)
+
+$ResultsFile = Resolve-Path $ResultsFile
+$Url = "https://ci.appveyor.com/api/testresults/$ResultsType/$($env:APPVEYOR_JOB_ID)"
+
+if(-Not (Test-Path $ResultsFile))
+{
+    Write-Host "File '$ResultsFile' not found"
+    exit(1)
+}
+
+# upload results to AppVeyor
+try
+{
+    $wc = New-Object 'System.Net.WebClient'
+    $wc.UploadFile($Url, $ResultsFile)
+    Write-Host "Tests result uploaded correctly"
+}
+catch
+{
+    Write-Host "Error uploading tests results to $Url"
+    $Exception = $_.Exception
+    
+    while($null -ne $Exception)
+    {
+        Write-Host "Error: $($Exception.Message)"
+        $Exception = $Exception.InnerException
+    }
+    
+    exit(2)
+}