[test_download] Print test names in case of network errors
[test_download] Add comments for nose parameters
[test_download] Modify outtmpl to prevent info JSON filename conflicts
Thanks @jaimeMF for the idea.
[travis] Only download tests should be run in parallel
* Rename options to preffixly match with --geo-verification-proxy
* Introduce _GEO_COUNTRIES for extractors
* Implement faking IP right away for sites with known geo restriction