Migrated to centralized build tools

Author: nicholasdille

Build/Start-Build.ps1

@@ -2,6 +2,7 @@ version: '{build}'
 skip_tags: true
 
 environment:
+  BuildToolsVersion: '1.1.*'
   StatementCoverageThreshold: 100
   FunctionCoverageThreshold: 100
   #SkipUnitTests: true
@@ -11,12 +12,19 @@ environment:
     secure: EaMePsm8eU/bUd1Ej83dTOAaGja/ht/3IrKC84nbZ9+dQbjeDfbTHk7nM+wp9DgE
   GitHubToken:
     secure: LznJHcvQE4ZRnDPWnayvawgr7VSpwH6ImeN6OK6tmLh5UHKdfZu6qKQ+ZBbkei73
-  CoverallsToken:
-    secure: /ngZ21bXk70+rS+xerRSmrIhpLu1l0mMICu62uo8Lp4YMlRCn5HoG3sBl/X2zRDv
 
 os: WMF 5
 
 build: false
 
 test_script:
-- ps: . .\build\Start-Build.ps1 -Task Deploy
+- ps: >-
+    $ErrorActionPreference = 'Stop';
+    $Response = Invoke-RestMethod -Uri 'https://api.github.com/repos/nicholasdille/powershell-build/releases';
+    $Release = $Response | Where-Object { $_.tag_name -like $env:BuildToolsVersion } | Sort-Object -Property tag_name -Descending | Select-Object -First 1;
+    Write-Host -ForegroundColor Yellow -Message "Using version $($Release.tag_name) of build tools";
+    Invoke-WebRequest -Uri $Release.zipball_url -OutFile Build.zip;
+    Expand-Archive -Path '.\Build.zip' -DestinationPath .;
+    Remove-Item -Path '.\Build.zip';
+    Get-Item -Path nicholasdille-PowerShell-Build-* | Rename-Item -NewName 'Build';
+    .\Build\Start-Build.ps1 -Task Deploy