switch appveyor py2.7 build to 64 bit

Author: wholmgren

appveyor.yml

@@ -10,9 +10,9 @@ environment:
     CMD_IN_ENV: "cmd /E:ON /V:ON /C .\\appveyor\\run_with_env.cmd"
 
   matrix:
-    - PYTHON: "C:\\Python27-conda32"
+    - PYTHON: "C:\\Python27-conda64"
       PYTHON_VERSION: "2.7"
-      PYTHON_ARCH: "32"
+      PYTHON_ARCH: "64"
 
     - PYTHON: "C:\\Python34-conda64"
       PYTHON_VERSION: "3.4"