BLE Client UART function

Dependencies:   RingBuffer

This is a BLE Client (Central) program for nRF51.
You can communicate with mbed BLE using "BLE_Uart_Server" program as follows.
/users/kenjiArai/code/BLE_Uart_Server/
Please refer following my notebook.
/users/kenjiArai/notebook/ble-client-and-peripheral-using-switch-sience-ty51/#

Revision:
0:0ef6455cbb4d
Child:
2:6fb0b87b041d
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sat Apr 16 07:32:21 2016 +0000
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+http://mbed.org/users/mbed_official/code/mbed/builds/082adc85693f
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