test conda with python 2 env

tests/conda/simple-py2/README.rst

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+Conda Environment
+-----------------
+
+Conda environments files may allow for more complex builds and dependencies. You
+can specify them in the standard `environment.yml` files.

tests/conda/simple-py2/environment.yml

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+dependencies:
+  - python=2
+  - numpy

tests/conda/simple-py2/verify

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+#!/usr/bin/env python
+import sys
+
+assert sys.version_info[:2] == (2, 7), sys.version
+
+import numpy