Add a "transliterate" formatter function.
Merge branch 'kovidgoyal/master'
Merge branch 'master' of https://github.com/cbhaley/calibre

Template language: Add a transliterate function, useful to convert
metadata in other languages into its approximate English representation,
when exporting books from calibre. Fixes #1249562 [Feature Request: option to transliterate metadata when sending to device](https://bugs.launchpad.net/calibre/+bug/1249562)