[2.0.0] Updated Client interface; adds timeout support

Merge pull request #2 from willroberts/2.0.0

2.0.0

Adjusts message interface

• Changes message body from type []byte to type string
• client.SendCommand() now returns type Message instead of type string

Async support + better interface

v1.0.1

Updates README.md

Initial releaase

v1.0.0

Adds LICENSE