added UC-232A Serial Port from ATEN manufacturer

Merge pull request felHR85#75 from felHR85/sync_example

Synchronous example and bug solved

added isSupported method

write and read functions perform asynchronously

Merge pull request felHR85#43 from felHR85/ch340_newdriver

Ch340 newdriver

Merge pull request felHR85#31 from felHR85/ftdi_sync

Ftdi sync

Update README.md

Info about synchronous operations

cosmetic change

Merge pull request felHR85#18 from StephaneBg/master

Update readme.

To avoid possible thread issues threads some changes and safeguards h…

…ave been added