fixing read and write for Windows

[mattficken]

reads used to have to wait for 4k or 8k buffer to fill, this fixes that by calling stream_set_chunk_size() on Windows.

PHP on Windows doesn't support COM10 or higher, but for COM1-COM9 this works for me on Windows 7 with an Arduino (Serial over USB using FTDI driver for Windows).

[Xowap]

Very interesting :)

I'm looking into this before merging it, just give me a few days