1.4
  - Run engine finalizer on R exit (requires Rcpp 0.12.10)
  - Move autobrew script to separate repository
  - Add symbol registration

1.3
  - tesseract() gains an 'options' parameter for setting engine variables
  - New tessseract_download() function for installing training data on Win/Mac
  - Initiate default tesseract engine onAttach() to fail for missing training data
  - Add support for ocr() on magick images

1.2
  - Try to fix build for CRAN OS-X, again.

1.1
  - Try to fix build for CRAN OS-X build server
  - Show 'loaded' and 'available' languages in print.tesseract()

1.0
  - Initial CRAN release
