* [DEV-76] handleGetBlockTemplateLongPoll to use tips instead of tip
* [DEV-76] move concatHashesToString to daghash package as JoinHashesStrings
* [DEV-76] use strings.Join for JoinHashesStrings
* [DEV-76] rename templateID -> longPollID
* [DEV-76] add function prefix to errors
* [DEV-97] Moved github.com/daglabs/btcutil into github.com/daglabs/btcd/btcutil.
* [DEV-97] Updated Gopkg.toml to no longer refer to btcutil.
* [DEV-97] Renamed btcutil to util.
* [DEV-82] break down main to packages
* [DEV-82] separate rpcserver and server
* [DEV-82] Fixed Windows-related code that failed to compile.
* [DEV-82] remove params.go and use only dagconfig.Params
* [DEV-82] fix log.go license