Revert "Add a minimal Tika Parser for RAR archives"

I personally do not need Tika support, and besides: Tika is not in Maven
Central. Therefore it would be too much hassle since all I need java-unrar
for is to have a nice .cbr file importer for ImageJ (see
https://github.com/dscho/import-rar).

This reverts commit ef84fa78885d6bf18a96be5ed08a6b62c27a4d61.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>