Ranking groups

[JoeyRubas]

closes #481. Generalized way to manage special ranking groups, like ESL speakers, debaters with no highschool experience etc. Sort of a niche feature, but ESL was requested and it seems better to create a generalized solution that can be used for anything of this nature, having ESL and EFL (foriegn language) at the same tournament is pretty common in BP for example

[codecov]

Codecov Report

❌ Patch coverage is 35.89744% with 50 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.30%. Comparing base (8581272) to head (b56ce31).

Files with missing lines	Patch %	Lines
mittab/apps/tab/views/views.py	11.53%	23 Missing ⚠️
mittab/apps/tab/forms.py	50.00%	11 Missing ⚠️
mittab/apps/tab/views/team_views.py	11.11%	8 Missing ⚠️
mittab/apps/tab/views/debater_views.py	30.00%	7 Missing ⚠️
mittab/apps/tab/models.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #485      +/-   ##
==========================================
- Coverage   61.65%   61.30%   -0.35%     
==========================================
  Files         101      102       +1     
  Lines        6765     6836      +71     
==========================================
+ Hits         4171     4191      +20     
- Misses       2594     2645      +51     

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