Init.

Signed-off-by: Aaron Xu <overheat1984@gmail.com>
- Modify for SecureCRT/Putty/Tera Term.
- add nrf_delay

Signed-off-by: Aaron Xu <overheat1984@gmail.com>
- add Echo for uart

Signed-off-by: Aaron Xu <overheat1984@gmail.com>
- add uart_trace(printf)

Signed-off-by: Aaron Xu <overheat1984@gmail.com>
- Disable Power off when Timeout(180)

Signed-off-by: Aaron Xu <overheat1984@gmail.com>
- add 1sec LED blinking.

Signed-off-by: Aaron Xu <overheat1984@gmail.com>
- add calender and print it.

Signed-off-by: Aaron Xu <overheat1984@gmail.com>
- add Buttons, one for user, another for bootloader.
- reorganization files, add timers.c/.h and buttons.c/.h
- use app_scheduler for timers and buttons and so on.
- prepare for pstorage

- Todo:
- Pstorage fix.

Signed-off-by: Aaron Xu <overheat1984@gmail.com>
- reorganize files, and add ble_rx.c and ble_rx.h.

Signed-off-by: Aaron Xu <overheat1984@gmail.com>
Merge branch 'master' of https://github.com/overheat/pca10001_ble_uart