Make range() inclusive.
improve wording
add comma.
Merge pull request #3451 from dereuromark/3.0-range

3.0 range
Rename classname to className in order to unify the different usage of it.
Also adjust variables to camelBacked.
Merge pull request #3455 from dereuromark/3.0-class-name

3.0 class name
Correct documentation.

configTransport() does not accespt closures anymore. None of the
registry based config() methods do either. This was left over by
accident when closure factories were removed.

Refs #3454
Return same instance when email transport was configured with an instance instead of a class name