Moved classes to individual files

- Created the IndividualSpeedTest (was SubTest), SpeedPings (was
Pings), and Pings (was Ping)
- All new class files have default check for name=main, and empty
documentation at top
- Changed imports for all sub class (should now work on Windows)
- Changed class constructor call in main.py
Edited README

- added name of folder
- fixed grammar
Merge branch 'Walker-Main/subClasses'