[WIP] 1.7 Support

Been updating mineflayer in order to bring 1.7 support (and to find bugs in node-minecraft-protocol 1.7). Currently, all the packet definitions in the plugins have been updated to use the packet name, and the fields were modified to reflect new names when they changed. 

Currently, all tests pass, but it's almost a guarantee that there is still a bunch of bugs left here and there. I'll be testing things left and right. 

Also, note that the package.json currently uses git URL instead of version for node-minecraft-protocol due to changes not yet pushed to NPM.