firefox-bin: update to version 34.0.5; thunderbird-bin: update to version 31.3.0

Firefox 34.0.5:
- Default search engine changed
- Firefox Hello real-time communication client
- JavaScript Template Strings
- HTTP/2 (draft14) and ALPN
- etc.

https://www.mozilla.org/en-US/firefox/34.0.5/releasenotes/

Thunderbird 31.3.0: Bug fixes.
https://www.mozilla.org/en-US/thunderbird/31.3.0/releasenotes/