Bug 1258700 - Generate Brotli-compressed versions of static files

WhiteNoise 3.0 now supports serving Brotli-compressed files to browsers whose `Accept-Encoding` includes `br`. Note: Both Firefox and Chrome only support Brotli over HTTPS. To take advantage of this, the Brotli package just needs to be available when the compression tool (`python -m whitenoise.compress`) is run. See: http://whitenoise.evans.io/en/latest/changelog.html#brotli-compression-support http://whitenoise.evans.io/en/latest/django.html#brotli-compression The WhiteNoise docs say to use an unofficial PyPI package (brotlipy), however this has a dependency on libffi (via cffi) and the official repo now has it's own Python wrapper that does not. As such, this commit instead uses the official Brotli package from GitHub, whilst we wait for the official PyPI release (google/brotli#72). The Brotli install works fine on stage/prod/Heroku/Travis. The Vagrant environment was missing g++, which is now installed during provision.
mozilla · Mar 24, 2016 · 1aeb69e · 1aeb69e
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diff --git a/puppet/manifests/classes/python.pp b/puppet/manifests/classes/python.pp
@@ -7,6 +7,8 @@
            "python-dev",
            # Required by pylibmc.
            "libmemcached-dev",
+           # Required by Brotli.
+           "g++",
            # To improve the UX of the Vagrant environment.
            "git"]:
     ensure => "latest",

diff --git a/requirements/common.txt b/requirements/common.txt
@@ -6,6 +6,12 @@ wsgi-sslify==1.0.1 --hash=sha256:cde368fda0fb9958dd58bc2cb955d0bf3df1b79c132d97c
 
 whitenoise==3.0 --hash=sha256:2537cf2b0c12e1c8beaa23605076344a89d08b686592abffddb6ba13b284a8c6
 
+# Used by the Whitenoise CLI tool to provide Brotli-compressed versions of static files.
+# There is not yet an official package on PyPI:
+# https://github.com/google/brotli/issues/72
+https://github.com/google/brotli/archive/v0.3.0.zip#egg=Brotli==0.3.0 \
+    --hash=sha256:0e1e88c74b5a4c9c39123fe8adfdce6262c80524398367420475716389d70791
+
 Django==1.8.10 --hash=sha256:471b41cb53d675138475b488c429424ed143e57ad755a2c8ab1206ac30490284
 
 celery==3.1.20 --hash=sha256:3071b71ef8c43178ace8435002b11f2ff06db7690f07d960540eab7f4183ddf7