Wireless device driver: detect future-dated books in the calibre library and refuse to sync them.
Conversion: Do not allow default (user-agent) style rules to ever override style rules defined in the input document, regardless of CSS selector specificity. Fixes #1369753 [conversion ignores "*" css selector](https://bugs.launchpad.net/calibre/+bug/1369753)
Use mutable object trick to change parent scope variable instead of using an instance attribute
Merge branch 'master' of https://github.com/cbhaley/calibre