Add better dask handling to DynamicAreaDefinitions

[djhoese]

See #344 for the details.

• Closes Improve handling of dask arrays in DynamicAreaDefinition #344
• Tests added
• Tests passed
• Passes git diff origin/master **/*py | flake8 --diff
• Fully documented

[codecov]

Codecov Report

Merging #346 (81bc10b) into master (9801978) will increase coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #346      +/-   ##
==========================================
+ Coverage   93.06%   93.29%   +0.23%     
==========================================
  Files          48       48              
  Lines        9843    10009     +166     
==========================================
+ Hits         9160     9338     +178     
+ Misses        683      671      -12     

Flag	Coverage Δ
unittests	93.29% <100.00%> (+0.23%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyresample/geometry.py	86.52% <100.00%> (+1.00%)	⬆️
pyresample/test/test_geometry.py	99.26% <100.00%> (+0.74%)	⬆️
pyresample/utils/proj4.py	100.00% <100.00%> (ø)
pyresample/utils/__init__.py	83.52% <0.00%> (-0.20%)	⬇️
pyresample/test/test_dask_ewa.py	98.85% <0.00%> (+0.01%)	⬆️
pyresample/ewa/dask_ewa.py	91.21% <0.00%> (+0.49%)	⬆️

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[coveralls]

Coverage increased (+0.2%) to 93.285% when pulling 81bc10b on djhoese:feature-dynamic-area-def-dask into 9801978 on pytroll:master.

[djhoese]

@mraspaud Well it works, but I'm not really happy with how gross the code got.

[mraspaud]

Some questions to start with

[ghost]

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[mraspaud]

LGTM