Merge branch 'master' of https://github.com/cbhaley/calibre
Fix infinite recursion for unknown translations
Avoid unnecessary traceback when loading plugins that dont have translations for the current UI language
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Fix plugins that use the polish infrastructure causing circular imports when start tweak book
Fix bug in cloneNode in lxml builder for html5lib parsing
Implement fixing html to create well formed markup
Make base directories only
Merge branch 'master' of https://github.com/jgoguen/calibre
Updates to various PostMedia news sources
Fix problems in cache caused by identical books (same uuid & format) on the device. Implement cache purging.