BatteryESRTester - First working, tested and calibrated unit

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First working, tested and calibrated unit

Changes

Revision	Date	Who	Commit message
4:f7cc009aed74	2017-03-27	ruairilong	Format code and remove unused functions. default tip
3:a170b248ead8	2017-03-27	ruairilong	Format code and remove unused functions.
2:ddc96642fcdb	2017-03-27	ruairilong	Add USB HID library.; Printf the tests results data over the HID keyboard device link; Add support for a push button that the user can push to initiate the battery tests.
1:0d88cfafe20e	2017-03-22	JoeMiller	Debugged and refined. Calibrated first board and tested
0:197cfa57c3c7	2017-03-22	JoeMiller	Initial trial test complete

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