Update mecab-ko-dic to 1.6.1-20140814

Updated mecab-ko-dic to 1.6.1-20140814. Also removed the caveats editing config manually and added a shell command to do it automatically instead.
Thanks, @dentarg. I converted my shell script to Ruby code which adds dicdir path in the end of the file rather than replacing any existing one.

@mistydemeo, could you please accept the PR if you don't have any concerns?