better build script

appveyor.yml

@@ -10,8 +10,12 @@ branches:
     - master
     - /release-.*/
 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(
         $("http://s3.amazonaws.com/"+$env:JULIAVERSION),
         "C:\projects\julia-binary.exe")
@@ -21,8 +25,8 @@ install:
 build_script:
 # Need to convert from shallow to complete for Pkg.clone to work
 #  - git fetch --unshallow
-  - C:\projects\julia\bin\julia-debug -e "versioninfo(); Pkg.init(); Pkg.clone(\"https://github.com/JuliaIO/FileIO.jl.git\")"
-  - C:\projects\julia\bin\julia-debug -e "Pkg.clone(\"Images\"); Pkg.checkout(\"Images\", \"sd/fileio\")"
+  - C:\projects\julia\bin\julia-debug -e "versioninfo(); Pkg.init(); Pkg.clone(\"https://github.com/JuliaIO/FileIO.jl.git\", \"FileIO\"")"
+  - C:\projects\julia\bin\julia-debug -e "Pkg.clone(\"Images\"); Pkg.checkout(\"Images\", \"sd/fileio2\")"
   - C:\projects\julia\bin\julia-debug -e "Pkg.clone(pwd(), \"ImageMagick\"); Pkg.build(\"ImageMagick\")"
 
 test_script: