Release version 0.2.0

enable client to connect non-local [ip:port]

Release version 0.1.0

fix heartbeat bug

Merge pull request #3 from fatedier/dev

1. Change directory structure and Makefile to let GOPATH=`pwd`, so wherever the project directory is, just use make to build.

Merge pull request #1 from fatedier/dev

1. if client is offline, server will release all resources
2. use a graceful method to shutdown go net.Listeners
3. add closeFlag for Conn, so startHeartBeat func can exit correctly now

Conflicts:
	cmd/frpc/config.go
	cmd/frpc/control.go
	cmd/frpc/main.go
	cmd/frps/config.go
	cmd/frps/control.go
	cmd/frps/main.go
	pkg/models/server.go