Unicode character read issue in ISA-Tab reader in docker image

[djcomlab]

4/5 tests fail in Jenkins on the container tests due to:

File "/usr/local/lib/python3.5/dist-packages/isatools/isatab.py", line 944, in _read_tab_section
    line = f.readline()
  File "/usr/lib/python3.5/encodings/ascii.py", line 26, in decode
    return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 2171: ordinal not in range(128)

Can't replicate locally, so likely a platform issue, and will need modifications to the ISA API code to ensure can be decoded more robustly.