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Add Viewer plugins API docs to the user manual
Nicer error message when failing to edit EPUB file with missing obfuscation key
Improve performance of rendering the book list when lots of column coloring rules are used

Merge branch 'master' of https://github.com/cbhaley/calibre
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Fix #1338219 [Tolino Shine SW Rev. 1.4.5 requires ebooks in directory Books](https://bugs.launchpad.net/calibre/+bug/1338219)
Update the GUI section of the User Manual
Add translated Quick Start Guides in French and German
Edit Book: Add buttons to change the text alignment of the current paragraph. If you do not see them, go to Preferences->Toolbars and add them to the Text formatting actions toolbar.
Add em tags around button title

to distinguish the button title better from the rest of the text, there should be something around it like <em> tags.
Merge branch 'patch-1' of https://github.com/nerdoc/calibre
Edit Book: When using the spell check dialog to change words, detect any changes made to open files outside the spell check dialog and automatically integrate them, to prevent those changes from being lost.
Edit book: Spell checker: Treat hyphenated words as single words for spell checking
pep8
When clicking in the search box, select all existing text, for easy replacement. Fixes #1338862 [[Enhancement] Search enhancements](https://bugs.launchpad.net/calibre/+bug/1338862)
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Start work on plugin framework for editor
Fix Documentation for list_re, list_re_group, first_matching_cmp, transliterate.

Fixes #1339296 [Fix documentation for some formatter functions.](https://bugs.launchpad.net/calibre/+bug/1339296)