Include PRs in continuous integration

[matkoch]

In order to make PR builds immediately available:

• Add branch specification +:refs/pull/*/head according to the blog post
• Pack with id <Package>-PR-<Sequence> and publish to MyGet
• Ensure that the build script was not modified

  if ((Get-FileHash "./build.cake").Hash -ne "%BuildScriptHash%") {
  Write-Host "##teamcity[buildProblem description='BuildScript Validation failed.']"
  }

• Add ability to reset hash

  
  $pair = "$(%username%):$(%password%)"

$encodedCreds = [System.Convert]::ToBase64String([System.Text.Encoding]::ASCII.GetBytes($pair)) $basicAuthValue = "Basic $encodedCreds" $Headers = @{ Authorization = $basicAuthValue }

Invoke-WebRequest -Uri 'https://teamcity.jetbrains.com/httpAuth/app/rest/projects/Testfx/parameters/BuildScriptHash' -Headers $Headers -ContentType "text/plain" -Method PUT ` -Body "hash"