Change format DOS to Unix and add LF to the end

I found a problem Google IME shows broken data when file format is DOS
and without a new-line code on End of file. Example is below

![Screenshot](http://gyazo.com/e5817ee31ac9598ffe918bc2ba9dced1.png)

This patch fixes this problem by unifing file format to Unix (LF) and
adding a LF code to end of each file.
Add parts-of-speech column to metro-color.txt

I have no idea about why, but my Google IME cannot import metro-color.txt whithout this modification.
Merge pull request #1 from ymrl/unify_fileformat_to_unix

Change format DOS to Unix and add LF to the end