Feature/aggregate counts

[rlskoeser]

Associated Issue(s): resolves #252

Changes in this PR

• Revise compile dataset logic to generate and save aggregate totals in poem and ppa metadata
• Support tar.gz when generating text corpus
• Add unit tests for compile dataset methods

[codecov]

Codecov Report

❌ Patch coverage is 98.09524% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.82%. Comparing base (ae8dbc9) to head (08735c9).
⚠️ Report is 36 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #260      +/-   ##
===========================================
- Coverage    80.32%   79.82%   -0.51%     
===========================================
  Files           22       23       +1     
  Lines         1982     2126     +144     
===========================================
+ Hits          1592     1697     +105     
- Misses         390      429      +39     

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