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Addresses https://issues.apache.org/jira/browse/MWRAPPER-147

Executing mvnw on Windows where the user name contains space results mvnw failing to launch Maven:

> mvnw
'C:\Users\John' is not recognized as an internal or external command,
operable program or batch file.
Cannot start maven from wrapper

This is a big annoyance esp. for first time users of Maven wrapper who have no clue whats going on.