Refactor to Externally Relevant Names / Domain Driven Design

[ShaunParsons]

Version 0.0.1 of this library brought together three public client libraries into one: persona, echo, and babel. Version 0.0.1 of this library brought them together without any significant change to the code from the existing individual libraries.

Moving forward in version 1.0.0, we should refactor away from internal Talis project names and instead use externally relevant names, for example, ListReviews and Files. We may also want to refactor to a more domain driven design rather than the current service driven design.