Implemented setClock for the Due as well

This allows users to change the I2C clock frequency
GSM: Updated PROGMEM compatibility with newer gcc
TFT: Update PROGMEM for compatibily with newer gccutility/Adafruit_ST7735.cpp
Merge pull request #2164 from cmaglie/gsm_progmem_update

GSM: Updated PROGMEM compatibility with newer gcc
Merge pull request #2166 from cmaglie/tft_progmem_update

TFT: Update PROGMEM for compatibily with newer gcc
Robot_Control: Update PROGMEM for compatibily with newer gcc
Updated revision log
Due: Wire.setClock can be called at any time

See #2157
Merge branch 'due_wire_setClock' into ide-1.5.x
Updated revision log
Merge branch 'ide-1.5.x' into HEAD
Workaround for MacOSX java dynamic library load weirdness

See #2161