Allow unicode characters in string/char literals and filenames

Ignore-this: c490e76bf3453271ccdd29ec8fd78461

darcs-hash:20140111192704-c1f02-b7b758effd6777e656045fad71e4d754596de1cc
[fork] README

Ignore-this: 87125ff2ead92f53de36d1986a7401f3

darcs-hash:20140225154416-3ca48-a4d2d35dd911ed67d3504e91cfa296e103adee69