App connectors: reshape some of the fetched data before exposing it

[bpierre]

Related: #238

Some examples include:

• Using Date rather than a string to represent the time.
• Exposing a clean title for the votes rather than a generic metadata.
• Adding properties we would calculate directly, e.g. by reflecting these utility functions on the Vote object directly.

Todo:

• Reshape Voting models
• Reshape Tokens models
• Reshape Finance models