Added AlterMakeham, AlterGompertz, Carriere1 and Carriere2 models

[leeyuntien]

This is in response to the issue #46 Parameterized Models to add 4 models, including AlterMakeham, AlterGompertz, Carriere1 and Carriere2.

[codecov]

Codecov Report

Merging #120 (1b9c1ca) into master (e7a98fe) will decrease coverage by 9.20%.
The diff coverage is 0.00%.

❗ Current head 1b9c1ca differs from pull request most recent head d962232. Consider uploading reports for the commit d962232 to get more accurate results

@@            Coverage Diff             @@
##           master     #120      +/-   ##
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- Coverage   89.97%   80.77%   -9.20%     
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  Files           9        9              
  Lines         369      411      +42     
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  Hits          332      332              
- Misses         37       79      +42     

Impacted Files	Coverage Δ
src/parameterized_models.jl	77.04% <0.00%> (-21.02%)	⬇️

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[alecloudenback]

Thank you! Can you also add tests?

I may be a bit delayed in reviewing the PRs, thank you for your patience!

[alecloudenback]

I think Makeham2 would be more consistent with the rest of the names. Same with AlterGompertz

[alecloudenback]

Todo:

• Change the AlterMakeham names to a Makeham2
• Add tests to compare the answers to a different source

[alecloudenback]

Hey @leeyuntien you commented on the associated issue. The reason I haven't merged this is to address the "to-dos" in my prior comment.

[yuntienlee]

Hey @leeyuntien you commented on the associated issue. The reason I haven't merged this is to address the "to-dos" in my prior comment.

i have changed some function names in the fork more-model, please review, thanks

[alecloudenback]

Thanks for making the name changes. Can you add some test cases? E.g. see some of the existing cases here: https://github.com/JuliaActuary/MortalityTables.jl/blob/master/test/parameterized_models.jl

Before merging new things we try to ensure correctness by testing the output of the new features/code.

If you need help with that I can do one of the functions you added as an example.