Arduino 1.x library issues and fixes

Arduino 1.x library issues and fixes (These and more are now in the chipKIT master branch)

pgmspace.h: http://www.arduino.cc/en/Reference/PROGMEM

###Example 1:

#include <avr/pgmspace.h>

source: https://github.com/adafruit/Adafruit_Sensor/blob/master/Adafruit_Sensor.cpp

###FIX https://github.com/adafruit/TFTLCD-Library/blob/master/Adafruit_TFTLCD.cpp

#if defined(__PIC32MX__)
    #define PROGMEM
    #define pgm_read_byte(addr) (*(const unsigned char *)(addr))
    #define pgm_read_word(addr) (*(const unsigned short *)(addr))
#endif
#if defined(__SAM3X8E__)
#include <include/pio.h>
    #define PROGMEM
    #define pgm_read_byte(addr) (*(const unsigned char *)(addr))
    #define pgm_read_word(addr) (*(const unsigned short *)(addr))
#endif
#if define(__AVR__)
#include <avr/pgmspace.h>
#endif

F() Store string in Flash:

###Example:

lcd.println(F("Const char in flash"));.

###Fix: http://chipkit.net/forum/viewtopic.php?f=7&t=1496

#if defined(__PIC32MX__)
  #if defined F
    #undef F
  #endif
  #define F(X) (X)
#endif

SoftwareSerial required (Super frustrating):

###Example 1: source: https://github.com/adafruit/Adafruit-GPS-Library/blob/master/Adafruit_GPS.h ###Example:

#if ARDUINO >= 100
 #include <SoftwareSerial.h>
#else
 #include <NewSoftSerial.h>
#endif

###Example 2: Source: https://github.com/adafruit/Adafruit-Thermal-Printer-Library/blob/master/Adafruit_Thermal.h

#if ARDUINO >= 100
 #include "Arduino.h"
 #include "SoftwareSerial.h"
#else
 #include "WProgram.h"
 #include "WConstants.h"
 #include "NewSoftSerial.h"
#endif

Issue: We don't have SoftwareSerial in chipKIT

###Fix, current: Replace by allowing the user to pass the SerialObject from sketch into library. Put conditions around SoftwareSerial.

###Fix, long term: Add support for SoftwareSerial even though we have more hardware serial available, and better off using the Hardware serial for projects. Also, 0023 we don't have NewSoftSerial either. Maybe include a version of that too.