Ledger integration (#931)

Merges the keybase and Ledger code from go-crypto (which is no more) into the SDK
Adds support for Ledger into gaiacli
Cherry-picks updated error handling from #1158

store/iavlstore.go

@@ -4,8 +4,9 @@ import (
 	"fmt"
 	"sync"
 
-	abci "github.com/tendermint/abci/types"
+	"github.com/tendermint/go-amino"
 	"github.com/tendermint/iavl"
+	abci "github.com/tendermint/tendermint/abci/types"
 	cmn "github.com/tendermint/tmlibs/common"
 	dbm "github.com/tendermint/tmlibs/db"
 
@@ -171,7 +172,13 @@ func (st *iavlStore) Query(req abci.RequestQuery) (res abci.ResponseQuery) {
 				break
 			}
 			res.Value = value
-			res.Proof = proof.Bytes()
+			cdc := amino.NewCodec()
+			p, err := cdc.MarshalBinary(proof)
+			if err != nil {
+				res.Log = err.Error()
+				break
+			}
+			res.Proof = p
 		} else {
 			_, res.Value = tree.GetVersioned(key, height)
 		}

store/iavlstore_test.go

@@ -5,8 +5,8 @@ import (
 
 	"github.com/stretchr/testify/assert"
 
-	abci "github.com/tendermint/abci/types"
 	"github.com/tendermint/iavl"
+	abci "github.com/tendermint/tendermint/abci/types"
 	cmn "github.com/tendermint/tmlibs/common"
 	dbm "github.com/tendermint/tmlibs/db"
 

store/rootmultistore.go

@@ -6,7 +6,7 @@ import (
 
 	"golang.org/x/crypto/ripemd160"
 
-	abci "github.com/tendermint/abci/types"
+	abci "github.com/tendermint/tendermint/abci/types"
 	dbm "github.com/tendermint/tmlibs/db"
 	"github.com/tendermint/tmlibs/merkle"
 

store/rootmultistore_test.go

@@ -4,7 +4,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	abci "github.com/tendermint/abci/types"
+	abci "github.com/tendermint/tendermint/abci/types"
 	dbm "github.com/tendermint/tmlibs/db"
 	"github.com/tendermint/tmlibs/merkle"