Supporting member application form

[annttu]

• Allow supporting member to be either person or organization
• Add application forms for supporting members.

[codecov-io]

Codecov Report

Merging #162 (2273d79) into master (39b9af3) will decrease coverage by 1.09%.
The diff coverage is 24.60%.

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
- Coverage   74.96%   73.86%   -1.10%     
==========================================
  Files          55       55              
  Lines        5336     5456     +120     
==========================================
+ Hits         4000     4030      +30     
- Misses       1336     1426      +90     

Impacted Files	Coverage Δ
membership/urls.py	100.00% <ø> (ø)
membership/views.py	24.20% <5.00%> (-2.54%)	⬇️
membership/forms.py	94.05% <100.00%> (+0.18%)	⬆️
membership/models.py	80.93% <100.00%> (+0.15%)	⬆️
membership/test_utils.py	100.00% <100.00%> (ø)
membership/tests.py	98.29% <100.00%> (+0.01%)	⬆️
...mbership/management/commands/generate_test_data.py	91.26% <0.00%> (+2.38%)	⬆️

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