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setup.py: Close open file handle before deleting

When installing Pillow onto a Vagrant virtual machine with Linux as the guest OS, and Windows as the host OS, setup.py fails with the error "Text file busy." The temporary installation directory is a shared folder from the host OS, mounted in the guest OS, and the underlying Windows file system doesn't allow deleting the "multiarch" temporary file while a file handle for it is still open. This change closes the file handle once it is no longer being used, but before the file itself is unlinked.
Merge pull request #844 from divergentdave/patch-1

setup.py: Close open file handle before deleting
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Detail test-installed.py

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Icns DOS fix --  CVE-2014-3589

Found and reported by Andrew Drake of dropbox.com
Merge pull request #845 from wiredfool/icns_cve

Icns DOS fix --  CVE-2014-3589
Update Changes.rst [ci skip]