Rename Model to ScoreDrivenModel

[raphaelsaavedra]

It was suggested that Model should be renamed to avoid conflicts with JuMP's API.

[codecov]

Codecov Report

Merging #145 (45ce93a) into master (feb92dc) will not change coverage.
The diff coverage is 97.82%.

@@           Coverage Diff           @@
##           master     #145   +/-   ##
=======================================
  Coverage   97.43%   97.43%           
=======================================
  Files          31       31           
  Lines        1090     1090           
=======================================
  Hits         1062     1062           
  Misses         28       28           

Impacted Files	Coverage Δ
src/distributions/betafour.jl	100.00% <ø> (ø)
src/univariate_score_driven_recursion.jl	88.63% <83.33%> (ø)
src/MLE.jl	95.77% <100.00%> (ø)
src/cross_validation.jl	100.00% <100.00%> (ø)
src/diagnostics.jl	83.33% <100.00%> (ø)
src/initial_params.jl	100.00% <100.00%> (ø)
src/model.jl	100.00% <100.00%> (ø)
src/opt_methods/IPNewton.jl	100.00% <100.00%> (ø)
src/opt_methods/LBFGS.jl	100.00% <100.00%> (ø)
src/opt_methods/NelderMead.jl	100.00% <100.00%> (ø)
... and 2 more

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