Add dissociate after current billing cycle

[annttu]

• Add "dissociate after current cycle" button to membership.

[codecov-io]

Codecov Report

Merging #147 into master will increase coverage by 1.19%.
The diff coverage is 95.32%.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
+ Coverage   74.22%   75.42%   +1.19%     
==========================================
  Files          56       57       +1     
  Lines        5517     5623     +106     
==========================================
+ Hits         4095     4241     +146     
+ Misses       1422     1382      -40

Impacted Files	Coverage Δ
membership/urls.py	100% <ø> (ø)	⬆️
membership/tests.py	98.3% <100%> (+0.05%)	⬆️
membership/migrations/0006_auto_20190706_1458.py	100% <100%> (ø)
membership/views.py	33.67% <83.33%> (+6.94%)	⬆️
membership/models.py	81.11% <95%> (+0.38%)	⬆️
membership/templatetags/reference_number.py	85.71% <0%> (+35.71%)	⬆️

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[codecov-commenter]

Codecov Report

Merging #147 into master will increase coverage by 0.89%.
The diff coverage is 95.32%.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
+ Coverage   74.53%   75.42%   +0.89%     
==========================================
  Files          56       57       +1     
  Lines        5505     5623     +118     
==========================================
+ Hits         4103     4241     +138     
+ Misses       1402     1382      -20     

Impacted Files	Coverage Δ
membership/urls.py	100.00% <ø> (ø)
membership/views.py	33.67% <83.33%> (+6.94%)	⬆️
membership/models.py	81.11% <95.00%> (+0.33%)	⬆️
membership/migrations/0006_auto_20190706_1458.py	100.00% <100.00%> (ø)
membership/tests.py	98.30% <100.00%> (+0.02%)	⬆️
sikteeri/iptools.py	66.17% <0.00%> (-20.59%)	⬇️
sikteeri/ForceDefaultLanguageMiddleware.py	75.00% <0.00%> (-12.50%)	⬇️
membership/utils.py	63.67% <0.00%> (-1.15%)	⬇️
membership/management/commands/makebills.py	90.12% <0.00%> (-0.58%)	⬇️
... and 41 more

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