BLD: Updates to match travis

BLD: Combine create and install

appveyor.yml

@@ -44,11 +44,8 @@ install:
   - powershell .\etc\install.ps1
   - SET PATH=%PYTHON%;%PYTHON%\Scripts;%PATH%
 
-  - cmd: conda create -n testenv --yes pip python=%PYTHON_VERSION%
+  - cmd: conda create -n testenv --yes -c quantopian pip numpy=%NUMPY_VERSION% scipy=%SCIPY_VERSION% ta-lib=0.4.9
   - cmd: activate testenv
-  - cmd: conda install --yes -c quantopian numpy=%NUMPY_VERSION% pandas=%PANDAS_VERSION% scipy=%SCIPY_VERSION% Cython=0.22.1 ta-lib=0.4.8
-  # remove these packages so our requirements can downgrade them
-  - cmd: conda remove --yes six pytz
   - cmd: pip install --upgrade pip coverage coveralls
   - cmd: pip install -r etc/requirements.txt
   - cmd: pip install -r etc/requirements_dev.txt
@@ -59,5 +56,5 @@ install:
 test_script:
   - cd \
   - pip freeze | sort
+  - nosetests tests/
   - flake8 zipline tests
-  - nosetests --with-timer --exclude=^test_examples --with-coverage --cover-package=zipline --timer-top-n=15