Add vendor dir (#16) (#4)

* Add vendor dir so builds dont require dep

* Pin specific version go-eth version

vendor/github.com/btcsuite/btcd/netsync/doc.go

@@ -0,0 +1,13 @@
+// Copyright (c) 2017 The btcsuite developers
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+/*
+Package netsync implements a concurrency safe block syncing protocol. The
+SyncManager communicates with connected peers to perform an initial block
+download, keep the chain and unconfirmed transaction pool in sync, and announce
+new blocks connected to the chain. Currently the sync manager selects a single
+sync peer that it downloads all blocks from until it is up to date with the
+longest chain the sync peer is aware of.
+*/
+package netsync