fixed PHY link status error for AT91SAM9260
Modify the interrupt interface implementations, changes in the part of the parameter definition.
Modified the interrupt function comments
remain the old handler to keep forward compatibility
bsp/simulator: enable mouse motion track in SDL

Tested OK in RTGUI repo.
add libc in link when enable RT_USING_NEWLIB
Merge pull request #55 from grissiom/bsp-sim-enable-mouse-move

bsp/simulator: enable mouse motion track in SDL
Merge pull request #54 from weety/new-branch

Modify the interrupt interface implementations and changes some parameters definition
implement __rt_ffs in kernel service library
implement __rt_ffs for armv5
Merge pull request #57 from weety/new-branch

implement __rt_ffs for armv5
add the first porting for lwip 1.4.1
Merge pull request #58 from BernardXiong/master

Add the first porting for lwip 1.4.1.
add roadmap 1.2.0
Merge pull request #59 from BernardXiong/master

add roadmap 1.2.0
code cleanup for interrupt description
adjust the format of document
fix compiling issue in Jz47XX
add comments to help understanding pthread
adding *~ to .gitignore