UI for new Add Cover tool
Edit Book: new tool to easily add a cover to the book. It automatically generates the HTML wrapper and takes care of marking the covers files as covers in the OPF.
Update Deadspin
Add a tweak to change the font size in the template editor
Removed template editor font size tweak. Added a font size spin box.
Allow changing font size in the template editor dialog

Merge branch 'master' of https://github.com/cbhaley/calibre
Fix store ebook.de
Merge branch 'master' of https://github.com/cbhaley/calibre
cdp plugin works with ads4books
Merge branch 'master' of https://github.com/t3d/calibre
version 1.42.0
rsync on my dev machine no longer supports -z
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Add missing parameter to unsafe_format to prevent exceptions in save-to-disk
Respect the strip_results parameter in unsafe_format. No one uses it so there isn't any rush to incorporate this push.
Merge branch 'master' of https://github.com/cbhaley/calibre
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Fix #1335468 [Editor: ValueError: No JSON object could be decoded](https://bugs.launchpad.net/calibre/+bug/1335468)