Added Close() for StanLogger to allow resources to be released #641
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If the logger is file based, allow file to be closed for proper
cleanup. This was found when running tests on Windows where test
log could not be cleaned-up because the file was still opened.
Also added some missing defers that would also cause some files
to fail to be deleted on test exit.
Signed-off-by: Ivan Kozlovic ivan@synadia.com