[scripts][s]: reinstate process.py removed in 9bd3f56496d8746cf644170530f4ea7b38409909.
[data/ch][xs]: change source_description to description.
[#46][s]: do some de-duping and improvement on us data.
[#45,data/us][s]: add missing keys based on title or abbreviation - fixes #45.

Probably want to have nicer keys - can be done as part of #46.
[#29,refactor][l]: rework data schema as per #29.

* datapackage.json: new schema with descriptions
* data: update all data in line with new schema (this should be lossless)
* scripts: conversion script
* app: minor update to app and templates for new schema