Make tld and language configurable

To scrape Google search results for other languages and countries, the
tad and language must be configurable.
Add command line parameters for TLD and language

Since language and TLD of Google search are configurable through an API,
they should also configurable through the command line interface.
Add i18n configuration options to README

The configuration options for language and TLD where still missing in
the README. Now there is also some basic documentation for them.
Add myself to the contributors list

😉
Merge pull request #11 from jehrhardt/i18n

Make language and country of Google search configurable