stack: Add Random number generation API
nrf51822/random: implement random API using RNG peripheral
nrf51822/random: Remove unused includes
examples: Add random example
Fix: modifications to compile with Nordic SDK v5.2.0 and GCC v4.9.0  (initial : 23/06/2014 23:33 GMT+2)
Fix: Makefile and .gitignore modifications to allow programming & debug with Eclipse under Windows
(initial : 24/06/2014 17:37 GMT+2 & 25/06/2014 13:58 GMT+2)
nrf51822/log: disable UART flow control
ll: Draft for connection initiating state (no Connection state yet)
ll: implemented data channel map & index selection for connection states
ll: Add connection context structure
ll: distinguish between CONNECTION_MASTER and CONNECTION_SLAVE states
ll: Add CONNECT_REQ PDU structure
ll: init functions for CONNECT_REQ PDU and connection context
ll: Completed actions to reply the CONNECT_REQ PDU in initiating state
ll: add ll_pdu_data struct for Data packets
ll: in ll_on_radio_rx(), rename rcvd_pdu by rcvd_adv_pdu
ll: in CONNECTION_MASTER state, start connection events (Empty PDUs only)
ll: implement ack/flow control and centralize outgoing packets preparation
nrf51822/radio: add debug option to visualize RX & TX timings on a GPIO pin
examples: add ll-initiator example