Simplify appveyor configuration and add python 3

Author: RJMW

appveyor.yml

@@ -1,22 +1,13 @@
-build: false
-
 environment:
   matrix:
-    - PYTHON_VERSION: 2.7
-      MINICONDA: C:\Miniconda-x64
+    - PYTHON: "C:\\Python27"
+    - PYTHON: "C:\\Python36"
 
-init:
-  - "ECHO %PYTHON_VERSION% %MINICONDA%"
+build_script:
+  - '%PYTHON%\python.exe -m pip install .'
 
-install:
-  - "set PATH=%MINICONDA%;%MINICONDA%\\Scripts;%PATH%"
-  - conda config --set always_yes yes --set changeps1 no
-  - conda update -q conda
-  - conda info -a
-  - "conda create -q -n test-environment python=%PYTHON_VERSION% numpy scipy networkx requests pandas pyqt -c conda-forge -c bioconda"
-  - activate test-environment
-  - python setup.py install
+before_test:
+  - '%PYTHON%\python.exe -m pip install coverage green'
 
 test_script:
-  - beams --help
-  - python setup.py test
+  - '%PYTHON%\python.exe -m green -vvv --run-coverage'