WIP: added spark core board

TODO:
- [ ] test
- [ ] restore examples/hello-world
- [ ] extend blacklists
again, just map the CC3000 to low-level devices:
```c
#define CC3000_SPI      SPI_0
#define CC3000_CS     GPIO_0
#define CC3000_INT    GPIO_1
#define CC3000_EN    GPIO_2
#define CC3000_WIFI_INT    GPIO_3
```
thats all you need... :-)