* Vagrantfile: install dev_tools
Follow-up on https://github.com/tendermint/tendermint/pull/2824
* update consensus params spec
* fix test name
* rpc_test: panic if failed to start listener
also
- remove http_server#MustListen
- align StartHTTPServer and StartHTTPAndTLSServer functions
* dep: allow minor releases for grpc
* Decouple StartHTTP{,AndTLS}Server from Listen()
This should help solve cosmos/cosmos-sdk#2715
* Fix small mistake
* Update StartGRPCServer
* s/rpc/rpcserver/
* Start grpccore.StartGRPCServer in a goroutine
* Reinstate l.Close()
* Fix rpc/lib/test/main.go
* Update code comment
* update changelog and comments
* fix tm-monitor. more comments
Closes: #2460
* Pass http.ServeTLS() errors back to the caller
* Update CHANGELOG
* Amend StartHTTPServer() too for consistency's sake
* Revert "Amend StartHTTPServer() too for consistency's sake"
This reverts commit 23bfb4c2e917f581702291fe3ea69fce23f8c89d.
```
data
A Primitive or Structured value that contains additional information about the error.
This may be omitted.
The value of this member is defined by the Server (e.g. detailed error information, nested errors etc.).
```
