This commit updates:
- bump version to v20190809
- fix PKG_LICENSE_FILES
- rename package names to kcptun-server, kcptun-client
- refactor Makefile
- merge config and service scripts
- add more config options to support all features
- add additional options: gogc, syslog, user
- add README.md

Reference:
- package shadowsocks-libev

Signed-off-by: Chao Liu <expiron18@gmail.com>