add functionality to specify audio controller.

if there is special tag, render audio controller into its tag.
if there is not special tag, render audio controller into default position.
support huge html.
remove download from alternative url.
embed site.id to voice files for easily clear voice file,
remove fragment when build path from requested url.
support separate start and end voice mark.
support separate start end end skip mark.
add support for too long sentence.
modify voice file location.
fix test to adapt new scraper spec.
fix test to adapt new open_jtalk spec.
modify test code to concise
unified interfaces.

* constructor takes config hash.
* use fixture's wav file in wav_to_mp3_spec.
fixed malformed voice file path.
prevent multiple startup Job::Service.
delete garbage record when job has finished.
reformat source code.
remove garbage record when job has finished.
fix some issues.

* call_in() method does not work.
* call() method does not work in `bundle exec rails c` console
concise job selection criteria.
introduce test http server.