* If widen is a Bool, it always determines whether widening occurs.
* If widen is :auto (the defualt), widening occurs for appropriate
seriestypes, unless lims were set manually
* Add ticks getter functions
* Add tick-getter functions for Plot objects
* Fix boiler-plate code in get_ticks
* Bump minor version + add tests
* Remove kwargs and add subplot test
* Add docstrings
* bump minor version
