Fix failing unit tests so CI can pass

[afuetterer]

As suggested in #437.

There are 3 failing unit tests:

FAILED tika/tests/test_ssl_link.py::CreateTest::test_url - urllib.error.HTTPError: HTTP Error 403: Forbidden
FAILED tika/tests/test_tika.py::CreateTest::test_remote_jpg - urllib.error.HTTPError: HTTP Error 403: Forbidden
FAILED tika/tests/test_tika.py::CreateTest::test_remote_pdf - urllib.error.HTTPError: HTTP Error 502: Bad Gateway

Questions

1. What is tika/tests/test_ssl_link.py supposed to test? The 403 Forbidden error occurs, because urlretrieve's headers are not welcome. If I replace the urltrieve with a requests get, I can get the image. But I don't know why this is tested at all. It tests if urlretrieve is working and can download a file? This has nothing to do with tika-python, right? I suggest dropping the test.
2. I guess also header issue
3. url outdated, service at http://appsrv.achd.net/reports/rwservlet?food_rep_insp&P_ENCOUNTER=201504160015 not available? what kind of file is needed here?

[chrismattmann]

Thanks @afuetterer agree on all fronts.

1. Let's remove the test_ssl_link.py test. Not sure what it's testing either and it has become outdated regardless.
2. Header issue. Please update.
3. Any old PDF file should do....

[afuetterer]

I opened #444 to address this issue.

[afuetterer]

Done via #444