Work around for roundf not being available in VisualStudio prior to version 12.0 (VS2013)
Fix for issue #157 created when PR #156 was merged.
Merge commit '9931a9572cb5f6ef32f822280237d074ad6eb477' into merge-test

* commit '9931a9572cb5f6ef32f822280237d074ad6eb477':
  Work around for roundf not being available in VisualStudio prior to version 12.0 (VS2013) Fix for issue #157 created when PR #156 was merged.