mecab-ko-dic 1.6.0-20140515

Updated to 1.6.0-20140515 and added Caveats that is important to make it work.
Thanks @mikemcquaid. I tested with your suggestion. **#{opt_lib}**/mecab/dic/mecab-ko-dic is resolved as **/usr/local/opt/mecab-ko-dic/lib**/mecab/dic/mecab-ko-dic which does not exist, while **/usr/local/lib**/mecab/dic/mecab-ko-dic does.

Should we create a symbolic link from #{opt_lib}/mecab/dic/mecab-ko-dic to /usr/local/lib/mecab/dic/mecab-ko-dic via the formula?