Stem install test errors: cached_tor_manual and arm.* image

  installation...                                      failed (0.00s)
test_install                                                 [FAILURE]
test_sdist                                                   [FAILURE]

======================================================================
FAIL: test_install
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Traceback (most recent call last):
  File "/Users/base/stem/stem/util/test_tools.py", line 152, in <lambda>
    self.method = lambda test: self.result(test)  # method that can be mixed into TestCases
  File "/Users/base/stem/stem/util/test_tools.py", line 225, in result
    test.fail(self._result.msg)
AssertionError: The following files were expected to be in our installation but weren't. Maybe our setup.py needs to be updated?

stem/cached_tor_manual.cfg

======================================================================
FAIL: test_sdist
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/base/stem/stem/util/test_tools.py", line 152, in <lambda>
    self.method = lambda test: self.result(test)  # method that can be mixed into TestCases
  File "/Users/base/stem/stem/util/test_tools.py", line 225, in result
    test.fail(self._result.msg)
AssertionError: Running 'python setup.py sdist' doesn't match our git contents in the following way. The manifest in our setup.py may need to be updated...

  * docs/_static/arm.png isn't expected in our release tarball
  * docs/_static/label/arm.png isn't expected in our release tarball
  * docs/_static/label/resources/arm.xcf isn't expected in our release tarball

----------------------------------------------------------------------
Ran 2 tests in 0.000s

FAILED (failures=2)