version 1.0, 2012-07-08 -- initial release

version 1.01, 2012-07-09 -- edited README

version 1.1, 2013-02-20 -- reset_units() runs on first import, and corresponding
changes to documentation. Also, don't mess up the random number generator
state, in case something else is using it. Added units pW, fF, aF.

version 1.11, 2013-02-21 -- fix packaging (edit MANIFEST.in so README gets
included).

version 1.12, 2013-06-22 -- fix packaging (remove UTF-8 BOM in .py files,
which seem to cause pip errors in python 3)

version 1.13, 2013-08-11 -- add more units related to moles and molarity

version 1.14, 2016-02-16 -- add millikelvin etc., and unicode aliases Å,
ħ (note that unicode identifiers only work in Python 3)

version 1.15, 2016-07-09 -- add angular frequency units Hz·2π, kHz·2π,
etc. (note that unicode identifiers only work in Python 3)
