Remove RT-Thread GUI from bsp/efm32
Add building status image
Merge pull request #33 from rogerz/efm32

Remove RT-Thread GUI from bsp/efm32
bsp/stm32f10x: remove the last calibration.c

This also provide an example to show how to use calibration feature in
the RTGUI.
remove gui examples

As part of RTGUI, we should also remove gui examples. Copy
demo/examples/* in RT-Thread/RTGUI to examples/gui in RTT When you need
them.
Merge pull request #34 from grissiom/rtgui-cali

bsp/stm32f10x: remove the last calibration.c
Merge pull request #35 from grissiom/remove-gui-examples

remove gui examples
Merge pull request #36 from rogerz/auto-ci

Add building status image in README
building.py: append messed up objs list, use extend to avoid that

The return type of SConscript is a subclass of UserList. We should use
extend to keep the depth of the list is always 1 when concatenate
SConscript return values. Thanks prife for making me realize that this
is really a problem.

Reported-and-Tested-by: prife
Merge pull request #37 from grissiom/fix-building-py

building.py: append messed up objs list, use extend to avoid that
basic mingw support for simulator: kernel and finsh
mingw support for simulator: dfs/fatfs
mingw support for simulator: dfs/dfs_win32
mingw support for simulator: dfs/uffs
mingw support for simulator: rtgui
app module support for simlator, first version
Merge branch 'master' of github.com:RT-Thread/rt-thread into sim-module
app module of simlator: rename librtthread.a to rtthread.lib after post-building
app module of simlator: simpliy command of building, now use `scons --def` to create rtthread.def which can used by msvc
app module simulator: add app module test cases