Switch Appveyor to 64 bit architecture

appveyor.yml

@@ -6,15 +6,15 @@ environment:
     CMD_IN_ENV: "cmd /E:ON /V:ON /C .\\devtools\\appveyor\\run_with_env.cmd"
 
   matrix:
-    - PYTHON: "C:\\Python35_32"
+    - PYTHON: "C:\\Python35_64"
       PYTHON_VERSION: "3.5"
-      PYTHON_ARCH: "32"
+      PYTHON_ARCH: "64"
       CONDA_PY: "35"
       CONDA_NPY: "112"
 
-    - PYTHON: "C:\\Python36_32"
+    - PYTHON: "C:\\Python36_64"
       PYTHON_VERSION: "3.6"
-      PYTHON_ARCH: "32"
+      PYTHON_ARCH: "64"
       CONDA_PY: "36"
       CONDA_NPY: "112"
 
@@ -23,7 +23,7 @@ install:
   # as well as pip, conda-build, and the binstar CLI
   - ps: . ".\\devtools\\appveyor\\install.ps1"
   - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
-  - conda config --add channels http://conda.binstar.org/omnia
+  - conda config --add channels omnia
   - conda config --add channels conda-forge
 
 build: false