Changed protocol version to 74 (1.6.2).  Made all immediately obvious changes to packets.  Still need to decode json and work on metadata.
Updated the chat packet because the data is now JSON.  Luckily Ruby has a JSON library built in.
Updated the item_types.tsv manually from http://www.minecraftwiki.net/wiki/Data_values .
Oops, lead and nametags are 64-stackable.
fixed the order of pitch and yaw in one of the packets
Made FarmBot work again by loosening up its requirements for the Y coordinate of items it goes after.
Merge branch 'dev/david/protocol_74'