[#254][m]: start on loading core config from a spreadsheet.
[refactor][s]: simplify stuff in model.
[#256,refactor][s]: remove the special case reviewers stuff.
[refactor][l]: major refactor around config and load of core data.

* #256 - move loading of "fixed" data and bulk data to util.js and tidy it up and put it under proper testing
* #255 - now have mocking in tests/base.js for fixed data (config, questions etc) and use this for util tests (more mocking we could do ...)
* #254 - more config include fixed data urls now run off config (loaded from csv file)
* Minor touching of actual app due to refactor (improvements) of the attributes on the model data object
Merge branch 'master' of github.com:okfn/opendatacensus