change root fs spi flash.
update i2c driver by wizardxbl, close issues #6.
fix crash bug when application module's name too long & update programs search directory to /SD/programs
update application icon
code clean up
remove mp3 when using GCC
update rtconfig.py: add r for EXEC_PATH.
*calibration.c :add the text to remind user  to calibration
Merge pull request #10 from nongxiaoming/nong_realtouch

*calibration.c :add the text to remind user  to calibration
add font.
add template.uvproj
add nand driver.
Merge remote-tracking branch 'remotes/origin/master'
delete old nandflash driver
add USB composite class feature
add usb device driver
add usb lib
add usb drivers
add usb device cdc example
add usb device udisk example