RF: remove datalad_deprecated dependency

[yarikoptic]

Was introduced in #94
with only hypothetical assumptions of the necessity. We are now hypothesizing
that it was not needed

[yarikoptic]

it wasn't hypothetical -- it was indeed due to use of ls:

______ ERROR collecting datalad_crawler/pipelines/tests/test_openfmri.py _______
ImportError while importing test module '/home/travis/build/datalad/datalad-crawler/datalad_crawler/pipelines/tests/test_openfmri.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
../../../virtualenv/python3.7.1/lib/python3.7/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
datalad_crawler/pipelines/tests/test_openfmri.py:61: in <module>
    from .. import openfmri
datalad_crawler/pipelines/openfmri.py:29: in <module>
    from datalad.api import ls
E   ImportError: cannot import name 'ls' from 'datalad.api' (/home/travis/virtualenv/python3.7.1/lib/python3.7/site-packages/datalad/api.py)
_ ERROR collecting datalad_crawler/pipelines/tests/test_openfmri_collection.py _
ImportError while importing test module '/home/travis/build/datalad/datalad-crawler/datalad_crawler/pipelines/tests/test_openfmri_collection.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
../../../virtualenv/python3.7.1/lib/python3.7/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
datalad_crawler/pipelines/tests/test_openfmri_collection.py:37: in <module>
    from ..openfmri import superdataset_pipeline as ofcpipeline
datalad_crawler/pipelines/openfmri.py:29: in <module>
    from datalad.api import ls
E   ImportError: cannot import name 'ls' from 'datalad.api' (/home/travis/virtualenv/python3.7.1/lib/python3.7/site-packages/datalad/api.py)
________ ERROR collecting datalad_crawler/pipelines/tests/test_xnat.py _________
ImportError while importing test module '/home/travis/build/datalad/datalad-crawler/datalad_crawler/pipelines/tests/test_xnat.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
../../../virtualenv/python3.7.1/lib/python3.7/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
datalad_crawler/pipelines/tests/test_xnat.py:56: in <module>
    from ..xnat import XNATServer
datalad_crawler/pipelines/xnat.py:43: in <module>
    from datalad.api import ls
E   ImportError: cannot import name 'ls' from 'datalad.api' (/home/travis/virtualenv/python3.7.1/lib/python3.7/site-packages/datalad/api.py)
=========================== short test summary info ============================
ERROR datalad_crawler/pipelines/tests/test_openfmri.py
ERROR datalad_crawler/pipelines/tests/test_openfmri_collection.py
ERROR datalad_crawler/pipelines/tests/test_xnat.py
!!!!!!!!!!!!!!!!!!! Interrupted: 3 errors during collection !!!!!!!!!!!!!!!!!!!!

fixing that

[codecov]

Codecov Report

Merging #119 (d444b19) into master (53121d7) will decrease coverage by 0.04%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
- Coverage   77.68%   77.64%   -0.05%     
==========================================
  Files          60       60              
  Lines        4710     4692      -18     
  Branches      699      699              
==========================================
- Hits         3659     3643      -16     
+ Misses        887      885       -2     
  Partials      164      164              

Impacted Files	Coverage Δ
datalad_crawler/pipelines/xnat.py	17.68% <ø> (-8.15%)	⬇️
datalad_crawler/pipelines/openfmri.py	84.74% <66.66%> (+3.38%)	⬆️
datalad_crawler/version.py	100.00% <100.00%> (ø)

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[yarikoptic]

green is good.