Merge pull request #57 from kito-cheng/master

Few clean up
Add .editorconfig (http://editorconfig.org/)
Check return code for InitHash in chewing_new
Clean up hash.c

 - It's time to release souls from purgatory, those
   code are hold here since 2006...
Refine ChoiceInfoAppendChi

 - sizeof(char) is always 1 by ANSI C standards.