Bug fixes / Improvements:
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 * revert some MSVC activation logic to still call vcvarsall directly in build script
 * fix Windows testing for binary prefix replacement (not done on win)
 * Add a warning message when conda-build can't create an environment due to unsatisfiable dependencies
 * Improve notion of whether a recipe uses a VCS in its metadata, or in its build

Known issues:
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 * Environment activation on Windows will not work until Conda 4.1.4 is released.  The activate.bat script does not look in the right place for the activate.d folder.
 * The test suite on Linux and Mac fails the python-build, python-run, and python-build-run tests, because an errant __conda-version__.txt file is somehow present.  It is not clear where it comes from, and each of these tests pass when run individually.  If you have mysterious issues, and you use __conda-version__.txt or files like it, please file an issue.

Contributors:
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 * @msarahan
 * @patricksnape