Removed __author__.
Added the new EditCongregationDialog.

This class will handle editing of congregations in the database.
Added constructor.
Passed the user's selection index to EditCongregationDialog()
Started implementing the new class.

Still have some issues to work out but will have to leave it for another day.
Changed the window's title and button to Edit.
Added submit_edit method.
Renamed Edit button to Save
Implemented loading congregation data from the database.

Also removed the old code.
Removed un needed code and added doc.

Removed dup_congregation because this method doesn't need to check for duplicates. Also added documentation for the argument 'row'.
Fixed docstring

Replaced :argument row: to :param row:.
Commented un
Removed unnecessary code.
Removed old code.
Close #58
Merge pull request #63 from TheoDevelopers/bug-fix-58

Fixed issue #58