Updates the toInstantiationType method in the csharp generator, Adds spec additionalProperties + nullable examples#2405

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wing328 merged 3 commits intoOpenAPITools:masterfrom

spacether:adds_additionalproperties_examples

Mar 20, 2019

Commits on Mar 15, 2019

Adds v2 spec additionalproperties examples, adds v3 spec nulllable model example, updates samples
spacether
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Remaining samples updates
spacether
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Commits on Mar 18, 2019

Adds csharp generator update to handle models with multilevel parent types, which works for the AdditionalPropertiesObject model, samples updated
spacether
committed