Grammar fix
Maodanp/http auth
Fixes #98.
merge some fix
1. The aes IV needs to be unique, but not secure. 2. The key should be 16, 24 or 32 bytes. Fixes #85.
Conflicts: src/frp/cmd/frpc/control.go src/frp/cmd/frps/control.go src/frp/models/config/config.go src/frp/models/server/server.go
add support for https
cmd/frps: fix a bug when vhost_http_port is not set, fix #30