test with julia stable & nightly as suggested by @tkelman in #2

appveyor.yml

@@ -1,11 +1,15 @@
 environment:
   matrix:
-  - JULIAVERSION: "x86/0.3/julia-0.3.0-win32.exe"
-  - JULIAVERSION: "x64/0.3/julia-0.3.0-win64.exe"
+# Releases
+  - JULIAVERSION: "stable/win32"
+  - JULIAVERSION: "stable/win64"
+# Nightlies
+  - JULIAVERSION: "download/win32"
+  - JULIAVERSION: "download/win64"
 
 install:
 # Download most recent Julia Windows binary
-  - ps: (new-object net.webclient).DownloadFile($("http://s3.amazonaws.com/julialang/bin/winnt/"+$env:JULIAVERSION), "C:\projects\julia-binary.exe")
+  - ps: (new-object net.webclient).DownloadFile($("http://status.julialang.org/"+$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