Msh can execute module directly. So try to auto-complete the path when
user press TAB. There is a chance that the path is a module.

modify the pixel format to RGB565 in sdl_fb.c

2.adjust some viable and micro name
3.some other small fix

Revert "Merge pull request #241 from bright-pan/master"

This reverts commit 5aeedc4f, reversing
changes made to 3d80e414.

This merge breaks every uart driver in all BSPs. @bright-pan , is there
any way to get this done without breaking existing code?

Fix rt_serial_control() bug for customized command and indent the code

Add RTS/CTS option in the serial framework. 

Add uart4 and uart5 device driver.

Add hardware flow support.
Use new struct serial_ringbuffer.

add JavaScript Interpreter

Add supports for UART0 to UART5 of beaglebone(black)

Pass USB CV test verification;
Code cleanup;

simulator: fix compile errors in nand driver(512+16)