Include usbmodem in list of serial ports

What steps will reproduce the problem?
1. Attach Arduino UNO to computer
2. Call serial.getPortNames()

What is the expected output? What do you see instead?
device names which start with usbmodem should be included in the list, as well 
as usbserial, and serial

What version of the product are you using? On what operating system?
JSSC 0.9 on OSX 10.8.2

Please provide any additional information below.
in SerialPortList.java#getMacPortNames, the line that reads:

if(!file.isDirectory() && !file.isFile() && 
file.getName().matches("tty.(serial.*|usbserial.*)")){

should be

if(!file.isDirectory() && !file.isFile() && 
file.getName().matches("tty.(serial.*|usbserial.*|usbmodem.*)")){

I presume this applies to Linux as well, but am not in a position to test it at 
the moment

Original issue reported on code.google.com by jockmur...@gmail.com on 20 Jan 2013 at 12:48

jdog456 / java-simple-serial-connector

Include usbmodem in list of serial ports #29