use S3 links on appveyor

and add fast-fail snippet

appveyor.yml

@@ -1,11 +1,9 @@
 environment:
   matrix:
-# Releases
+  - JULIAVERSION: "julialang/bin/winnt/x86/0.5/julia-0.5-latest-win32.exe"
-  - JULIAVERSION: "stable/win32"
+  - JULIAVERSION: "julialang/bin/winnt/x64/0.5/julia-0.5-latest-win64.exe"
-  - JULIAVERSION: "stable/win64"
+  - JULIAVERSION: "julianightlies/bin/winnt/x86/julia-latest-win32.exe"
-# Nightlies
+  - JULIAVERSION: "julianightlies/bin/winnt/x64/julia-latest-win64.exe"
-  - JULIAVERSION: "download/win32"
-  - JULIAVERSION: "download/win64"
 
 notifications:
   - provider: Email
@@ -14,8 +12,13 @@ notifications:
     on_build_status_changed: false
 
 install:
+# If there's a newer build queued for the same PR, cancel this one
+  - ps: if ($env:APPVEYOR_PULL_REQUEST_NUMBER -and $env:APPVEYOR_BUILD_NUMBER -ne ((Invoke-RestMethod `
+        https://ci.appveyor.com/api/projects/$env:APPVEYOR_ACCOUNT_NAME/$env:APPVEYOR_PROJECT_SLUG/history?recordsNumber=50).builds | `
+        Where-Object pullRequestId -eq $env:APPVEYOR_PULL_REQUEST_NUMBER)[0].buildNumber) { `
+        throw "There are newer queued builds for this pull request, failing early." }
 # Download most recent Julia Windows binary
-  - ps: (new-object net.webclient).DownloadFile($("http://status.julialang.org/"+$env:JULIAVERSION), "C:\projects\julia-binary.exe")
+  - ps: (new-object net.webclient).DownloadFile($("http://s3.amazonaws.com/"+$env:JULIAVERSION), "C:\projects\julia-binary.exe")
 # Run installer silently, output to C:\projects\julia
   - C:\projects\julia-binary.exe /S /D=C:\projects\julia