[compost] module with test data

[ahdinosaur]

so we could do agent/stores/agents#getInitialState like:

  getInitialState: function () {
    return toImmutable(require('data/agents'))
  },

until we have proper fetching with https://github.com/open-app/holodex/issues/80

[ahdinosaur]

i'm thinking it's maybe not a bad idea to continue using Enspiral data as our test data to motivate development, as opposed to a more minimal set of data.

TODO:

• [ ] write migration script from current format of enspiral-data to new format.
• [ ] write script to transform csv files to require-able json files