[btcsuite/btcwallet] d76627: Update for recent chaincfg API changes. (#451)

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcwallet
  Commit: d76627e6d55d153d72f64c9480b19212d63650d6
      
https://github.com/btcsuite/btcwallet/commit/d76627e6d55d153d72f64c9480b19212d63650d6
  Author: Dave Collins <d...@davec.name>
  Date:   2016-08-12 (Fri, 12 Aug 2016)

  Changed paths:
    M glide.lock
    M rpc/legacyrpc/methods.go
    M rpc/rpcserver/server.go
    M votingpool/example_test.go
    M votingpool/factory_test.go
    M wallet/createtx.go
    M wallet/wallet.go
    M wtxmgr/example_test.go
    M wtxmgr/tx.go
    M wtxmgr/tx_test.go

  Log Message:
  -----------
  Update for recent chaincfg API changes. (#451)

Since the coinbase maturity is now allowed to be defined per chain and
the old blockchain.CoinbaseMaturity constant has been removed, this
updates the code accordingly.

Also, update glide.lock to use the required version of btcd.