Manual merge of 102

[radiac]

Took changes from #102, refactored and added tests

[codecov-commenter]

Codecov Report

Merging #128 (367fc2c) into develop (78432ee) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #128   +/-   ##
========================================
  Coverage    99.59%   99.59%           
========================================
  Files           25       25           
  Lines         1716     1719    +3     
========================================
+ Hits          1709     1712    +3     
  Misses           7        7           

Impacted Files	Coverage Δ
tagulous/constants.py	100.00% <ø> (ø)
tagulous/models/models.py	99.66% <100.00%> (ø)
tagulous/views.py	100.00% <100.00%> (ø)

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