Parse date values returned from earthranger

[atmorling]

closes #223

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 10.00000% with 36 lines in your changes missing coverage. Please review.

Project coverage is 62.97%. Comparing base (55e989a) to head (e50160e).
Report is 7 commits behind head on master.

Files	Patch %	Lines
ecoscope/io/earthranger.py	5.55%	17 Missing ⚠️
ecoscope/io/async_earthranger.py	6.66%	14 Missing ⚠️
ecoscope/io/earthranger_utils.py	28.57%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #231       +/-   ##
===========================================
- Coverage   73.61%   62.97%   -10.64%     
===========================================
  Files          29       30        +1     
  Lines        2240     2304       +64     
===========================================
- Hits         1649     1451      -198     
- Misses        591      853      +262     

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