Try using Miniconda already on Appveyor rather than downloading

Author: takluyver

appveyor.yml

@@ -3,30 +3,20 @@ matrix:
   fast_finish: true
 
 environment:
-  CONDA_INSTALL_LOCN: "C:\\conda"
   matrix:
     - CONDA_PY: 35
+      CONDA_INSTALL_LOCN: "C:\\Miniconda35-x64"
     - CONDA_PY: 27
+      CONDA_INSTALL_LOCN: "C:\\Miniconda-x64"
 
 platform:
   - x64
 
 build: off
 
 install:
-  - appveyor DownloadFile "https://raw.githubusercontent.com/conda-forge/conda-smithy/master/bootstrap-obvious-ci-and-miniconda.py"
-  - cmd: python bootstrap-obvious-ci-and-miniconda.py %CONDA_INSTALL_LOCN% %platform% %CONDA_PY:~0,1% --without-obvci
-
-  # Add a hack to switch to `conda` version `4.1.12` before activating.
-  # This is required to handle a long path activation issue.
-  # Verbatim from https://github.com/conda-forge/conda-smithy/pull/329
-  - cmd: set "OLDPATH=%PATH%"
-  - cmd: set "PATH=%CONDA_INSTALL_LOCN%\\Scripts;%CONDA_INSTALL_LOCN%\\Library\\bin;%PATH%"
-  - cmd: conda install --yes --quiet conda=4.1.12
-  - cmd: set "PATH=%OLDPATH%"
-  - cmd: set "OLDPATH="
-
   - cmd: call %CONDA_INSTALL_LOCN%\Scripts\activate.bat
+  - cmd: conda update --yes --quiet conda
   - cmd: conda config --set show_channel_urls true
   - cmd: conda config --add channels conda-forge
   - cmd: conda install -y pyzmq tornado jupyter_client nbformat nbconvert ipykernel pip nodejs nose