Stabilize Vanilla Base Price

[Libbum]

Closes #27 when complete

[codecov]

Codecov Report

Merging #28 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
- Coverage   88.92%   88.91%   -0.02%     
==========================================
  Files          14       14              
  Lines         840      839       -1     
==========================================
- Hits          747      746       -1     
  Misses         93       93

Impacted Files	Coverage Δ
src/2013RVanilla.jl	100% <100%> (ø)	⬆️
src/ScenariosVanilla.jl	100% <100%> (ø)	⬆️

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[codecov]

Codecov Report

Merging #28 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
+ Coverage   88.92%   88.99%   +0.06%     
==========================================
  Files          14       14              
  Lines         840      845       +5     
==========================================
+ Hits          747      752       +5     
  Misses         93       93

Impacted Files	Coverage Δ
src/ScenariosVanilla.jl	100% <100%> (ø)	⬆️

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[Libbum]

In the end this was relatively simple: we just needed to fix the upperbound of cprice regardless of scenario.