Can say round thousands
Tests for any four-digit number
Remove unneeded code
Able to say any 4 digit number
Extract hundreds name to it's own method
Fix small bug in calculating hundreds digit
Tests for up to six figures numbers
Merge pull request #1 from DavidIvy003/four_digits

Able to say all 4 digit numbers
Fix test expectation
It can say any six-digit number
Test for round millions