Spit into astview script and astviewer.py module
Showing message box when file not found
Put file name in the window title
Fixed selecting the text until the end of the document.
Implemented asteviewer.view()
Added source_code parameter to constructor.
Refactoring: moved setting members to _open_file()
Able to open all files in open dialog.
Handle case where file does not parse.
Tweaked with sizes.
Renamed astview to pyastviewer
Renamed pyastview to pyastvierwer
Max line length 100
Added installer.
Added CHANGES.
Implemented mode parameter.
Updated readme.md
Added screen shot