Version 0.1.6
 * Corrected DOI formatting in DESCRIPTION to meet CRAN requirements.

Version 0.1.5
 * Further reduction in code speed to satisfy CRAN checks

Version 0.1.4
 * Fixes to correct items reported in manual CRAN check
 * Added citation into the DESCRIPTION

Version 0.1.3
 * Fixed CRAN errors
 * updated citation to published paper

Version 0.1.2
 * Fixed CRAN errors
 * removed dependency on binostics

Version 0.1.1
 * Updated to work with new version of dplyr and tibble.
 * Removed dependency on mbgraphic (index functions now available in tourr).
