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If the last-modified date for any of the sources is higher than the
last-modified date of the JAR produced by maven, then a warning will be
emitted to make sure the user is aware that her/his changes may not be
in effect.

This modification also fails silently, e.g. if `find` is missing, or if
the user doesn't have the right version of `stat` to support the printf
flag.

Updated the nanodb script to properly handle being run under Git Bash.
Needed to wrap the Java program with "winpty" when starting it from Git
Bash.

Also updated the Surefire configuration to not require all tests to pass
before building a JAR file.  There are a few tests that aren't working
on Windows due to file-locking differences from *NIX.