[RXTX] Updated to RXTX 2.2 library.
[RXTX] Updated to RXTX 2.2 library.

Used RXTX 2.2 library, it seems to work better than 2.1.7.

Signed-off-by: Tatiana Leon <8c4753e861fecbb16ba9ebac0b105a2d4612071d@digi.com>
digidotcom/XBeeJavaLibrary,brucetsao/XBeeJavaLibrary,GUBotDev/XBeeJavaLibrary