Commit Briefs
topng: 64-bit fix
R=rsc http://codereview.appspot.com/2124042
make flate crc32 work when ulong is 64 bits
R=, rsc CC= http://codereview.appspot.com/203061
R=rsc http://codereview.appspot.com/2124042
R=, rsc CC= http://codereview.appspot.com/203061