implement an ipfs patch command for modifying merkledag objects

WIP: object creator command

better docs

move patch command into object namespace

dont ignore cancel funcs

addressing comment from CR

add two new subcommands to object patch and clean up main Run func

cancel contexts in early returns

switch to util.Key

record/record.go

@@ -6,11 +6,13 @@ import (
 	proto "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/gogo/protobuf/proto"
 
 	key "github.com/ipfs/go-ipfs/blocks/key"
+	dag "github.com/ipfs/go-ipfs/merkledag"
 	ci "github.com/ipfs/go-ipfs/p2p/crypto"
 	pb "github.com/ipfs/go-ipfs/routing/dht/pb"
 	eventlog "github.com/ipfs/go-ipfs/thirdparty/eventlog"
 )
 
+var _ = dag.FetchGraph
 var log = eventlog.Logger("routing/record")
 
 // MakePutRecord creates and signs a dht record for the given key/value pair