Adding graphic mode and bugfixing

What did I?
Application with graphic mode. After enter opinion and push 'Start!'
button application:
- if there are spell mistakes: app inform about detected mistakes and
  suggest proposition of corrections,
- if there are no mistakes: app display list of stems for every word of
  opinion.
After push "Clear!" button text area is cleaned.

* How did I?
- Added OpWatcher: View (graphic mode), Model (logic) and
  Controller (catch requests and pass it to model and view) classes.
  These classes are facades of system layers (model, view, controller).
- Added TextIntoWordsTokenizer class which before splitting text,
  removes all 'not allowed' characters (mainly digits and special char)

* Note
Using left-arrow button user can go to every line above in TextArea and
change text. In final version it should be improved.