KarolS/units — pull request #2 by mkiedys (2014-07-05 19:47:32+00:00)
Title: Add new prefixes for ampere, henry, ohm and volt

New prefiexes and implicit conversions for:
* ampere: nA, µA, mA
* henry: nH, µH, mH
* ohm: nΩ, µΩ, mΩ, kΩ, MΩ
* volt: nV, µV, mV, kV