Non-blocking example of the LWIPInterface

Dependencies:   LWIPInterface NetworkSocketAPI mbed-rtos mbed

Non-blocking example for the NetworkSocketAPI. Attempts to get the device's public facing IP address from ifcfg.me using the Happy Eyeballs algorithm to fetch an IPv4 or IPv6 address.

Revision:
63:167bee3360ac
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Apr 20 00:52:44 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/082adc85693f
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