Unihan-etl

- Fix readme bug on pypi

- Support for exporting in YAML and JSON
- More internal factoring and simplification
- Return data as list

- Drop python 3.3 an 3.4 support

- Rename from cihaidata_unihan unihan_tabular
- Drop datapackages in favor of a universal JSON, YAML and CSV
export.
- Only use UnicodeWriter in Python 2, fixes issue with python
would encode `b` in front of values

- Rename _scripts/_ to _cihaidata_unihan/_

- Enable invoking tool via `$ cihaidata_unihan`