Point nightlies at FF31ESR.
Bug #12873: Re-enable TLSv1.1 and v1.2 for Meek.
Bug 12462: Enable HTTPSHandler in Python.
Bug 12798: Add pulseaudio development headers.
Bug 12461: New compiler for Tor Browser ESR 31.

Tor Browser based on Firefox ESR 31 needs a newer compiler. GCC 4.4 is
not supported anymore. We chose the latest GCC (4.9.1) as we don't want
to bump the version again when we start deploying hardened builds.
Bug 11189: Adding BUILD_HOSTNAME.
Bug 12811: Bumping mingw-w64 commit.

Tag 3.1.0 is too old for building Firefox ESR 31.
mbsdiff is not linked as mbsdiff.exe anymore.

This got fixed by https://bugzilla.mozilla.org/show_bug.cgi?id=933120.
Use newer libfaketime (0.9.6).

libfaketime 0.8 breaks the ESR 31 build (see #12461 comment 8 and later
and #12812 comment 8 for the gory details). We therefore use a newer
version that provides us with an environment variable to skip certain
processes when faking time.
Package clean-up in descriptors.
Bump NoScript version in nghtly builds.