Log Message:
(math/R-units) Updated 0.8.1 to 0.8.2

# version 0.8-2

* Names are preserved when doing unit conversions; #305 @billdenney

* Identical units will always divide (`/`) and allow integer division (`%/%`).
  And, inverse units will always be able to multiply; #310 @billdenney

* Compare units via `ud_compare()`, fixing inconsistent results for aliases
  and symbols; #339, #346, #347

* Fix `units<-()` to treat an empty unit the same as `NULL`; #332

* New `as.data.frame()` method for `mixed_units`; #309

* Use short paths for database loading on Windows to fix UTF-16 issues; #342

* Add example in the docs about reversing a ggplot2 units scale; #343

* Force storage mode to double; #344 addressing #324

* Fix units in transformed axis; #323

* Consider unitless as radians in trigonometric functions; #328