Pygubu

* Added Toplevel widget
* Added generic Dialog widget
* Rewrited scrolledframe widget internals, ideas and code taken from tkinter wiki.
* Added more widget icons.
* Fixed bugs.

* Allow to select control variable type
* Fixed some bugs.

* Added more wiki pages.
* Fixed issues 3, 4

* Separate designer module from main package
* Added menu to select current ttk theme
* Fix color selector issues.

* Add validator for pax and pady properties.
* Improved ScrolledFrame widget.
* Added more wiget icons.
* Fix cursor type on preview panel.

* Added translation support
* Translated pygubu designer to Spanish