Allows to add DOI to feature_properties and make DOI searcheable by elasticsearch

[azneto]

• adds the option DOI to the load_feature_annotation command
• updates retrieve_feature_id to identify soterm-accession
• updates to handle multiple annotation attributes
• assign publication to the feature
• updates to show annotations
• creates the function get_doi
• adds facet doi
• adds doi to the index

I hereby agree to licence this and any previous contributions under the terms of the GNU General Public License version 3 as published by the Free Software Foundation

I have read the CONTRIBUTING.rst file and understand that TravisCI will be used to confirm the tests and flake8 style checks pass with these changes.

I am happy be thanked by name in the CONTRIB.rst files, and have added myself to the file as part of this pull request. (This acknowledgement is optional. Note we list the names sorted alphabetically.)

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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[codecov-commenter]

Codecov Report

Merging #336 (7aac197) into master (3316e5e) will decrease coverage by 1.08%. The diff coverage is 17.00%.

@@            Coverage Diff             @@
##           master     #336      +/-   ##
==========================================
- Coverage   67.57%   66.48%   -1.09%     
==========================================
  Files          30       30              
  Lines        4129     4213      +84     
  Branches      717      728      +11     
==========================================
+ Hits         2790     2801      +11     
- Misses       1280     1350      +70     
- Partials       59       62       +3     

Impacted Files	Coverage Δ
machado/forms.py	0.00% <0.00%> (ø)
machado/search_indexes.py	0.00% <0.00%> (ø)
machado/views/search.py	0.00% <0.00%> (ø)
machado/decorators.py	30.51% <12.50%> (-4.44%)	:arrow_down:
machado/loaders/feature.py	66.26% <14.28%> (ø)
machado/loaders/featureattributes.py	58.77% <19.04%> (-19.12%)	:arrow_down:
machado/loaders/common.py	70.70% <100.00%> (+1.23%)	:arrow_up:

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