Small change in reload command output
Minor refactoring in frame command
Bring CHANGELOG up to date
Remove `info stack` command
Add missing entry to CHANGELOG
Smarter way of resetting default settings
Remove `method iv`, it doesn't belong there
Minor fix in GUIDE
One file per command
New module/class hierarchy for the test suite

Everything is now under the `Byebug` namespace
Whitespace
I prefer this style