Dataset citations

[kennymckormick]

Add citations in tools/data

[codecov]

Codecov Report

Merging #289 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
- Coverage   85.10%   85.05%   -0.06%     
==========================================
  Files          88       88              
  Lines        5994     5994              
  Branches      983      983              
==========================================
- Hits         5101     5098       -3     
- Misses        708      709       +1     
- Partials      185      187       +2     

Flag	Coverage Δ
#unittests	85.05% <ø> (-0.06%)	⬇️

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Impacted Files	Coverage Δ
mmaction/core/evaluation/accuracy.py	89.85% <0.00%> (-1.45%)	⬇️

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