Make CsvMapper default to alphabetic sorting of properties

[cowtowncoder]

Since ordering of properties is important, and since the default ordering is unspecified (or arbitrary) -- JDK does not guarantee that fields or methods are returned in any particular ordering -- it makes sense to default ordering to lexicographic (alphabetic).
Users can still override this if need be.

Change can be made in 2.2, but not in 2.0.x patch versions.

[cowtowncoder]

Implemented for 2.3.0