Added device STM32F4, tested with STM32F401RE (Nucleo R401).
Added init sequence to ZOLEN 12864 COG LCD.
Corrected bug in text.c for correct print Mikroeletronica fonts.
Updated include paths in glcd.h and glcd_devices.h
Created a define for SPI prescaller in STM32F4.h.
Updated some comments.
Updated README.md
Added a definition for using RTOS delay milliseconds function.
Updated comments.
Merge pull request #5 from miguelmoreto/master

STM32F4 support, Zolen LCD and text.c bug