Log Message:
Update to 31.0

* Update enigmail to 1.7

Changelog:
    NEW
    Autocompleting email addresses now matches against any part of the name or \ 
email (bug 529584)

    NEW
    Composing a mail to a newsgroup will now autocomplete newsgroup names (bug 61491)

    FIXED
    Insecure NTLM (pre-NTLMv2) authentication disabled (see 828183)

Fixed in Thunderbird 31
MFSA 2014-66 IFRAME sandbox same-origin access through redirect
MFSA 2014-65 Certificate parsing broken by non-standard character encoding
MFSA 2014-64 Crash in Skia library when scaling high quality images
MFSA 2014-63 Use-after-free while when manipulating certificates in the trusted cache
MFSA 2014-62 Exploitable WebGL crash with Cesium JavaScript library
MFSA 2014-61 Use-after-free with FireOnStateChange event
MFSA 2014-59 Use-after-free in DirectWrite font handling
MFSA 2014-58 Use-after-free in Web Audio due to incorrect control message ordering
MFSA 2014-57 Buffer overflow during Web Audio buffering for playback
MFSA 2014-56 Miscellaneous memory safety hazards (rv:31.0 / rv:24.7)