Bug 840094 - Change how nsZipArchive logging works. r=taras,r=gps

Now log in a single file given by the MOZ_JAR_LOG_FILE environment variable.
Log entries contain the URI of the Zip archive, followed by the path in the
archive.
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Bug 840094 - Fixup for debug builds failure because of nsZipArchive::CloseArchive being called several times
Bug 834337 - Make chrome/chrome/content/branding/favicon64.png the first file in omni.ja. r=blassey