Updated ru_RU person provider dictionaries to use unicode literals w/o `u` prefix.

Signed-off-by: Alexander Shvetsov <ashvetsov@definitif.ru>
Implemented initials generation for ru_RU person names.

Signed-off-by: Alexander Shvetsov <ashvetsov@definitif.ru>
Implemented ru_RU city names generation using `.last_name()` generator and pre-defined cities list.

Signed-off-by: Alexander Shvetsov <ashvetsov@definitif.ru>
Implemented ru_RU company names generator.

Signed-off-by: Alexander Shvetsov <ashvetsov@definitif.ru>
Implemented draft merchandise names and modifications generator.

This functionality is inspired by Centrobit's product Agora (http://agorab2b.ru).

Signed-off-by: Alexander Shvetsov <ashvetsov@definitif.ru>