Speedup by calling Buffer.concat less often.

Hello @evansolomon, 

Please review the following commits I made in branch 'tyler-less-concat-calls'.

23afd5aacac4431e9f43a68ae9187914799f4e9b (2013-09-06 04:36:59 +0000)
Speedup by calling Buffer.concat less often.


R=@evansolomon