Please visit https://git.oschina.net/supergis/ESP8266Lib to get it.
ESP8266Lib will using soft serial on baud rate 9600. If your 8266 module is not for 9600, need update the latest firmware to 9600 of version 0.91,which can be find on subdirectory.
willcome to fork it and submit the update to me.
You can commit a issue on project homepage to help promote it.
Enjoy the ESP8266 and Arduino.