refactor application.WindowSpecification class
fix some unresloved pep8 error in application.WindowSpecification
fix docstring style in application.Application
cancel __start & __connect methods in application.Application
change the name of start_() method in application.Application to start
change the name of connect_() method in application.Application to connect
change top_window_ to top_window
change active_ to active
change name of window(s)_ method to window(s)
refactor the rest of methods in application.Appliction
Merge branch 'refactor_application_Application' into dev
refactor functions in application.py
fix import error & docstring styple
refactor methods in findwindows.py