Description
When using dev:create-dump without arguments, the command generates a zip archive containing all dump files.
The file name of this zip archive is the current date, for instance:
Feb 14, 2011 2:24:23 PM.zip
It's not really a very good name, especially on Unix.
We should use a DateFormat by default to generate a file name looking like:
2011-02-14_142423.zip