Handle header values with spaces, allow header keys to contain dashes.
Handle header values with spaces, allow header keys to contain dashes.

rakyll/hey,sunyi00/boom,rjeczalik/boom,zhaohaidao/boom,rmoorman/boom,espebra/boom,orthogonous/boom,mtojek/boom,wyg3958/boom,sschepens/pla,mantyr/boom,scalp42/boom,xuyi/boom,rakyll/boom,gsquire/boom,ringtail/boom,torfuzx/boom,snowsnail/boom