Conda Package plus streamlining

[drwelby]

0.16.7 was supposed to be the last '16 release but in fixing up the Conda packaging I made enough changes to warrant a new release.

• New meta.yaml built from conda skeleton and then edited down
• Dropping 3.4 support since it's EOLed
• 3.7 seems to work
• Deleted conda-build-config.yaml since we build a noarch: python package
• Deleted environment.yaml since it was comically out of date

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In the dependencies:

pip install dask and conda install dask are not the same thing!

Conda's dask is all of Dask and all of its dependencies, even Pandas! What we want is actually dask-core, which is just all of Dask and equivalent to pip install dask.

Meanwhile, pip install dask installs all of Dask, and we only need the array part, so we can just require dask[array] to lighten it up.

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Stole @cderwin's makefile from PyVeda to make OSX installs a little easier.

make osx sets the OpenSSL library options before pip installing

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Fixed up the tests so they all pass and got rid of the AssertEqual warnings.

[codecov-io]

Codecov Report

Merging #767 into master will decrease coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #767      +/-   ##
=========================================
- Coverage   81.44%   81.4%   -0.05%     
=========================================
  Files          91      91              
  Lines        6404    6404              
=========================================
- Hits         5216    5213       -3     
- Misses       1188    1191       +3

Impacted Files	Coverage Δ
tests/unit/test_workflow.py	100% <100%> (ø)	⬆️
tests/unit/test_meta.py	100% <100%> (ø)	⬆️
tests/unit/test_simpleworkflow.py	98.9% <100%> (ø)	⬆️
tests/unit/test_image_fetch.py	100% <100%> (ø)	⬆️
tests/unit/test_interface.py	95.23% <100%> (-4.77%)	⬇️
gbdxtools/auth.py	87.75% <0%> (-4.09%)	⬇️

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