Add `version.py` to ignore list

Add automatically-generated `version.py` source file to ignore list.
Add import statements for version information

Update main package `__init__.py` to import version information from
`version.py`.
Implement Eurostat TSV code

Implement Eurostat TSV data-processing code, as template for future
reader modules.

Update `setup.py` to install package.

Update description in README file.

Add Travis-CI configuration file.