Basic Documenter setup.

[tkoolen]

Also:

• julia -> jldoctest
• fix doctests
• use MOIU.MockOptimizer to implement mock_model instead of using MockModel. Deprecate MockModel().
• properly attach inner constructor docstrings (docstrings for inner constructors are ignored JuliaLang/julia#16730).

[codecov]

Codecov Report

Merging #87 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
- Coverage   97.86%   97.85%   -0.02%     
==========================================
  Files           9        9              
  Lines         515      512       -3     
==========================================
- Hits          504      501       -3     
  Misses         11       11

Impacted Files	Coverage Δ
src/functions.jl	99.24% <ø> (ø)	⬆️
src/model.jl	96.1% <ø> (ø)	⬆️
src/parameter.jl	100% <ø> (ø)	⬆️
src/debug.jl	100% <ø> (ø)	⬆️
src/lazyexpression.jl	100% <ø> (ø)	⬆️
src/mockmodel.jl	100% <100%> (ø)	⬆️

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