#2968 Deleted the TikaInputStream reference

Keep in mind that right now I think we must change something into the dotmarketing-config.
Especially two things:

1. the TIKA_PARSE_CHARACTER_LIMIT setted to -1 is dangerous because can throws an OutOfMemoryException: I think that we must set the default to 100000 (or 200000);
2. the CONTENT_PARSERS and the CONTENT_PARSERS_MIMETYPES are unused right now.