Kodi-nfo-generator

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- added `kodi-nfo-guess` tool that performs online database searches for directories
that miss meta-files, like `.imdb`, which the `kodi-nfo-gen` tool uses as input.

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- adding `user-agent` to request headers now (https://github.com/fracpete/kodi-nfo-generator/pull/6)
- only making IMDB request when `--overwrite` flag present or `.nfo` not present, to avoid making
too many calls to IMDB
- the `--delay` no longer applies when not writing a file
- fixed TV show .nfo generation (https://github.com/fracpete/kodi-nfo-generator/issues/1)
- added `download-missing` choice for downloading fanart only when it is missing locally
(`download` always performs a download)

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- not all movie meta-data contains the `actor` field, now checking whether present
(https://github.com/fracpete/kodi-nfo-generator/pull/4)

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- `setup.py` excludes versions of beautifulsoup that don't work
(https://github.com/fracpete/kodi-nfo-generator/issues/2)
- added experimental support for generating .nfo output for TV series episodes
(https://github.com/fracpete/kodi-nfo-generator/issues/1)

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- ratingValue is now set as string, not float; better handling when
preflang_title not available

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- restricting beautifulsoup version to <=4.6.0 as newer versions fail:
https://github.com/fracpete/kodi-nfo-generator/issues/2