first, fast port for Kinetis K60

simple example for TWRK60N512 board, project is for IAR 6.50. This example
blink with LED.
add lwip 1.4.1 with simple example
fix lwIP task create function

- fix architecture specific task create function sys_thread_new - bad
  stack address initialization - cause a memory leak
- fix release target for lwip example
- modify stack sizes and coos memory heap
source code reorganization

- change directory structure
- add some cmsis headers (partial implementation)
- code cleaning
- projects are separate - ready for new devices
add new device MK70F with examples

- support for IAR and CoIDE
- lwIP example for TWR-K70F120 board
- blink example for TWR-K70F120 board
- fix bad stack size calculation in lwIP
- modify startup for GCC - add interrupt vectors
- modify ethernet interrupt handlers
- modify IAR project interrupts vectors table
- code cleaning
add K60D support and project for CoIDE

- new blink project for CoIDE
- new lwIP project for CoIDE
- new startup and processor header for K60D
fix K70F interrupts index table
change CoIDE projects debugger settings and update startup files

- minor update on startup for K60D and K70F
add support for FPU (Cortex M4F)

- add FPU support to context switch, lazy stacking (Cortex M4F)
- add support for interrupts handlers with float point content
- new example/test project K70F_fpu
Modify bug of sem
add copy right of coos
http://www.coocox.org/forum/topic.php?id=4262
今天测试CoOS -1.1.5的消息队列时，发现初始化消息队列为5个时：

queue_usart1 = CoCreateQueue(MailQueue_usart1,6-1,EVENT_SORT_TYPE_FIFO);

其实际效果为6，不知道这是为什么
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Mpdify this Bug
处理 论坛 http://www.coocox.org/forum/topic.php?id=4262  反馈的 sem mbox 类似问题
Merge remote-tracking branch 'remotes/maslo/fpu' into fpu
Add FPU support on coos