[refactor][xs]: change README file extension to .md.
[dp.json][s]: add a datapackage.json including quite a bit of source info (but no resources yet!).
[refactor][s]: remove config.json and its use and export to csv file (not stdout).
[setup][xs]: make deps non-specific to versions.
[gitignore][xs]: .
[refactor][s]: use DictWriter and reduce what we store in output CSV.

* completely remove calculation and storage of wdmmg_color codes (completely unnecessary)
* comment out storing descriptors for cofog and pog (just store codes).

Result: CSV goes from 41Mb to 12Mb.
[fix][xs]: convert pog 99999.0 code to 99999.
[README][xs]: update to reflect new processing setup.
[scripts][s]: write out departments and pog codes to separate csv files.
[data,dp.json][l]: add CRA data (2010) plus associated code lists.
[README][s]: add better documentation of the dataset using content from http://datahub.io/dataset/ukgov-finances-cra.