Refactor to fix issues with context handling and use instance methods

[ganemone]

Fixes #78
Fixes #79

[codecov]

Codecov Report

Merging #80 into master will increase coverage by 2.71%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #80      +/-   ##
==========================================
+ Coverage   72.65%   75.37%   +2.71%     
==========================================
  Files           8        8              
  Lines         128      134       +6     
  Branches       32       31       -1     
==========================================
+ Hits           93      101       +8     
+ Misses         22       21       -1     
+ Partials       13       12       -1

Impacted Files	Coverage Δ
src/prepare.js	89.74% <100%> (+0.85%)	⬆️
src/prepared.js	77.77% <100%> (+2.77%)	⬆️
src/utils/isReactCompositeComponent.js	75% <0%> (+25%)	⬆️

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[KevinGrandon]

Nice test!

[ganemone]

!merge