Trying to fix appveyor failure:
```
Obtaining file:///C:/projects/tahoe-lafs
Complete output from command python setup.py egg_info:
warning: no previously-included files found matching 'pyproject.toml'
Installed c:\projects\tahoe-lafs\.eggs\setuptools-41.0.1-py2.7.egg
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:\projects\tahoe-lafs\setup.py", line 297, in <module>
**setup_args
File "c:\python27\Lib\distutils\core.py", line 111, in setup
_setup_distribution = dist = klass(attrs)
File "C:\projects\tahoe-lafs\.tox\coverage\lib\site-packages\setuptools\dist.py", line 272, in __init__
_Distribution.__init__(self,attrs)
File "c:\python27\Lib\distutils\dist.py", line 287, in __init__
self.finalize_options()
File "C:\projects\tahoe-lafs\.tox\coverage\lib\site-packages\setuptools\dist.py", line 327, in finalize_options
ep.load()(self, ep.name, value)
File "C:\projects\tahoe-lafs\.tox\coverage\lib\site-packages\pkg_resources\__init__.py", line 2202, in load
return self.resolve()
File "C:\projects\tahoe-lafs\.tox\coverage\lib\site-packages\pkg_resources\__init__.py", line 2212, in resolve
raise ImportError(str(exc))
ImportError: 'module' object has no attribute 'check_specifier'
```
Name it "trial_test_log.txt", so it can be read in a browser, not just
downloaded.
I'm hoping this will help track down why
test_magic_folder.RealTest.test_batched_process occasionally times out on
windows.
