Update Storage Emulator to v5.2

Author: Jeavon

appveyor.yml

@@ -11,6 +11,14 @@ cache:
 init:
   - set UMBRACO_PACKAGE_PRERELEASE_SUFFIX=beta
 
+install:
+  - ps: >-
+      $msiPath = "$($env:USERPROFILE)\MicrosoftAzureStorageEmulator.msi"
+
+      (New-Object Net.WebClient).DownloadFile('https://download.microsoft.com/download/F/3/8/F3857A38-D344-43B4-8E5B-2D03489909B9/MicrosoftAzureStorageEmulator.msi', $msiPath)
+
+      cmd /c start /wait msiexec /i $msiPath /quiet
+
 build_script:
 - build-appveyor.cmd