Tails 1.3.1 emergecy release fixes security issues

Tails 1.3.1, is out. This is an emergency release, triggered by an unscheduled Firefox release meant to fix critical security issues.

This version fixes numerous security issues and all users should upgrade as soon as possible:

• Tor Browser: Mozilla Foundation Security Advisory 2015-28, Mozilla Foundation Security Advisory 2015-29
• Linux: CVE-2015-1465, CVE-2015-1420 and CVE-2015-1593
• OpenSSL: Debian Security Advisory 3197
• file and libmagic: Debian Security Advisory 3196
• libxfont: Debian Security Advisory 3194
• tcpdump: Debian Security Advisory 3193
• libgnutls26: Debian Security Advisory 3191
• libav: Debian Security Advisory 3189
• FreeType 2: Debian Security Advisory 3188
• ICU: Debian Security Advisory 3187
• NSS: Debian Security Advisory 3186
• libgcrypt11: Debian Security Advisory 3185
• GnuPG: Debian Security Advisory 3184
• libssh2: Debian Security Advisory 3182
• libarchive and bsdtar: Debian Security Advisory 3180
• libgtk2-perl: Debian Security Advisory 3173
• CUPS: Debian Security Advisory 3172