Extract Audioset Labels

[adelavega]

• Extracts Audioset Labels
• Fixes bug in avg_run_duration computation
• Updates bibliography for Audioset and BERT extractors

[codecov-io]

Codecov Report

Merging #743 into master will decrease coverage by 1.34%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #743      +/-   ##
==========================================
- Coverage   84.72%   83.38%   -1.35%     
==========================================
  Files          67       63       -4     
  Lines        3104     2823     -281     
==========================================
- Hits         2630     2354     -276     
+ Misses        474      469       -5     

Impacted Files	Coverage Δ
neuroscout/models/task.py	96.15% <100.00%> (+0.50%)	⬆️
neuroscout/populate/annotate.py	86.27% <100.00%> (+0.13%)	⬆️
neuroscout/tests/request_utils.py
neuroscout/tests/conftest.py
neuroscout/tests/test_models.py
neuroscout/tests/test_views.py

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