Describe ebola model

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This issue is for a discussion and description of a stochastic model of ebolavirus disease (EVD) for {epidemics}.

The goal of adding this model to {epidemics} is to provide the capability to model EVD outbreaks and haemorrhagic fevers more generally.

This model is intended to be a stochastic, individual-based implementation because most EVD outbreaks are understood to start out small, with the initial number of infections sufficiently low that stochasticity is expected to play an important role in the outbreak dynamics.

The starting point for this general model is expected to be this paper by Li et al. describing an ensemble of 37 EVD models.

This issue is a work in progress.

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Closing this as the ebola model has been added in #71 and #110.