Replace RXTX with JSSC implementation
Commit some pending changes.

Update jssc library to 2.8.0 version.
Remove old rxtx files.

Known issues:
 -JSSC doesn't notify when serial port has been closed. A fix for this needs upstream
 changes.
Fix compilation errors related to removing RXTX specific function
Merge pull request #185 from amorellgarcia/jssc-serial-alpha

Jssc serial alpha; the dice has been thrown