fix(encoding): Fix "lxml.etree.SerialisationError: IO_ENCODER" caused by encoding and/or bad characters
fix(encoding): Fix "lxml.etree.SerialisationError: IO_ENCODER" caused by encoding and/or bad characters

Couldn't reproduce it with local tests, but the real example URL that causes the error is http://www.bbc.com/news/business-29431984.

Closes #40

cronycle/python-goose,jetruby/python-goose,tanzaho/python-goose,cronycle/python-goose,tanzaho/python-goose,jetruby/python-goose,cronycle/python-goose,tanzaho/python-goose,jetruby/python-goose