Starting a small paradigm shift which will simply add `Smart` to several widgets that usually require a `tkinter.variable` to associate and watch for changes.
* Removed `DropDown` in favor of `SmartOptionMenu`
* Added `SmartSpinBox`
* Added [documentation](http://pythonhosted.org/tk-tools/)
Wheel files can be found on [PyPi](https://files.pythonhosted.org/packages/99/b0/323559a39d05c6bbd964cc9cbe012cb98b0f74f7f36984f7370744e9a4e2/tk_tools-0.2.0-py3-none-any.whl).