serialport v1.0.0

[Oleg B]

Stable version of serialport package

* Blocking `SerialPortBlk` for classic usage

* Non-blocking `SerialPortNonBlk` and `SerialPortFR` for usage in 
fibers or in vibe-d

* Variative initialization and configuration

* Hardware flow control config flag

Doc: http://serialport.dpldocs.info/v1.0.0/serialport.html
Dub: http://code.dlang.org/packages/serialport
Git: https://github.com/deviator/serialport