merge pull reqeuest #45: add PHP 7.2 Compatibility
merge pull reqeuest #46: Make sure the "orderby" query var is a string when sorting by columns.
merge pull reqeuest #55: Fix column mismatch broken sort
merge pull reqeuest #56: Grammar mistakes corrected
merge pull reqeuest #61: Fix incorrect property types
merge pull reqeuest #62: Allow for multiple taxonomies and post types to be added
merge pull reqeuest #63: Update Taxonomy columns documentation
merge pull reqeuest #64: Update minimum PHP version, phpunit and phpcs
merge pull reqeuest #19: Use wp_dropdown_categories function for post filtering selectbox
update minimum php version to 5.6
fix issue #9: add unit tests
create Taxonomy class
fix issue #11: add columns()
to Taxonomy class
update examples/books.php
fix PHPCS as dev requirement
add version to composer json
fix issue #8: Error with $addTaxonomy
fix issue #6: problem registering existing taxonomies
add issue #1: Add PHPCS and Travic integration
merge pull request #3: Add labels()
method to PostTypes