update ctype to 0.5.3 to get rid of npm warning
update ctype to 0.5.3 to get rid of npm warning

DinoChiesa/node-http-signature,LeisureLink/node-http-signature,arekinath/node-http-signature,bsletten/node-http-signature,Aloomaio/node-http-signature,joyent/node-http-signature