PNI / Mbed 2 deprecated BatteryESRTester

First working, tested and calibrated unit

Dependencies:   mbed USBDevice

Diff: USBDevice.lib

Revision:
2:ddc96642fcdb
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBDevice.lib	Mon Mar 27 20:54:42 2017 +0000
@@ -0,0 +1,1 @@
+https://mbed.org/users/mbed_official/code/USBDevice/#01321bd6ff89