debian/NEWS: adding note around increased default TLS version 1.2

Closes: #761245
document changes and release 33.0~b1-1
debian/source.filter: more files to ignore
debian/README.source: adjust description for beta versions
Imported Upstream version 34.0~b1
Merge tag 'upstream/34.0_b1' into debian/experimental

Upstream version 34.0~b1

# gpg: Unterschrift vom Mi 12 Nov 2014 18:31:47 CET mittels RSA-Schlüssel ID 251D1DB0
# gpg: Korrekte Unterschrift von "Carsten Schoenert <c.schoenert@t-online.de>"
rebuild patch queue from patch-queue branch

obsolete patches (fixed upstream):
porting-armel/disable-some-libopus-feature-for-ARCH-ARMv6.patch
debian/rules: be more flexible on *.xpi files

Mozilla has changend the internal build structure for the Lightning and
GData_Provider extension. To get such changes more dynamically handeld
in the future let the unzip command get a variable instead of a
hardcoded folder.
debian/NEWS: fixing a typo in the second paragraph
debian/NEWS: adding notes around new security changes

As Mozilla has dropped the SSL 3.0 support and implement a setting for
TLS protocal version fallbacks adding some infos around this into
debian/NEWS and debian/README.Debian.

Thanks to Ralf Jung and kiki coco for some suggestions and corrections.