gui_hello:modify to use touch_calibration_init function to init touch unit.
gui_photo_frame:modify to use touch_calibration_init function and modify the picture directory to "/picture"
drivers:fix the nand flash driver bug for use lpcopen EMC_Init.
realboard:delete the old calibration file which never use.
realboard:modify the touch to use the calibration app in rtgui,remove the old calibration
Merge pull request #27 from nongxiaoming/master

update the example for the new touch driver and calibration application