add support for C++11 numeric_limits::max_digits10 and ::lowest
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Merge pull request #7 from danieljames/metadata

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Merge pull request #5 from robin-eckert/cpp11limits

add support for C++11 numeric_limits::max_digits10 and ::lowest
include io.hpp for streaming operators
Merge branch 'develop' of https://github.com/boostorg/units into feature/user-defined-literals