Upgrade docs requirements.

* alabaster to 0.7.9 (required by Sphinx)
* pytz to 2016.7
* Sphinx to 1.4.8

requirements/docs.txt

@@ -7,15 +7,15 @@ Pygments==2.1.3 \
     --hash=sha256:485602129949b14247e8b124d28af4654dffbd076537c4a9c44a538a2c1755b7 \
     --hash=sha256:88e4c8a91b2af5962bfa5ea2447ec6dd357018e86e94c7d14bd8cacbc5b55d81
 # Sphinx is required by sphinxcontrib-httpdomain
-Sphinx==1.4.4 \
-    --hash=sha256:8152493561599d4cc6fd82bd1fdec840c2d743dad116c94eec1783d737d53fdf \
-    --hash=sha256:3effd6373734bd59f7457fed2f0bd4ba7ec3c70b4598d7c2e5193a42209dbfa0
+Sphinx==1.4.8 \
+    --hash=sha256:c715b714228bd135a41b33ff91e5f41ac434ceb6e98a86447687a2177e7486b9 \
+    --hash=sha256:41af978f653ef862eb4bb3776dabd8ff13afed17e431907310fe990a3947707f
 # alabaster is required by Sphinx
-alabaster==0.7.8 \
-    --hash=sha256:e86ae2eb1a0297454ce6bbe94414fbb272ed9f148b9ca5344dc213164e0d3d74 \
-    --hash=sha256:a1cb1b94fcc192ff74ca212d6ef5cb543bb169cfe7991c2b9df256bb354c1fff
+alabaster==0.7.9 \
+    --hash=sha256:d3e64a74919373d6d4d1d36bd717206584cb64cbb0532dfce3bc2081cba6817b \
+    --hash=sha256:47afd43b08a4ecaa45e3496e139a193ce364571e7e10c6a87ca1a4c57eb7ea08
 # babel is required by Sphinx, django-babel, puente
-babel==2.3.4 \
+Babel==2.3.4 \
     --hash=sha256:3318ed2960240d61cbc6558858ee00c10eed77a6508c4d1ed8e6f7f48399c975 \
     --hash=sha256:c535c4403802f6eb38173cd4863e419e2274921a01a8aad8a5b497c131c62875
 # docutils is required by Sphinx
@@ -25,22 +25,23 @@ docutils==0.12 \
 imagesize==0.7.1 \
     --hash=sha256:6ebdc9e0ad188f9d1b2cdd9bc59cbe42bf931875e829e7a595e6b3abdc05cdfb \
     --hash=sha256:0ab2c62b87987e3252f89d30b7cedbec12a01af9274af9ffa48108f2c13c6062
-markupsafe==0.23 \
+MarkupSafe==0.23 \
     --hash=sha256:a4ec1aff59b95a14b45eb2e23761a0179e98319da5a7eb76b56ea8cdc7b871c3
 # pytz is required by Babel, celery
-pytz==2016.4 \
-    --hash=sha256:7b705b7cdadfa89b8e1dae38efe9a6deb41b5cefac35aa8bbfc2318cb09ebd63 \
-    --hash=sha256:8781cdd3ca70f5a536884e051797ca213b9ff479a5c1cc57240adf37cc1eff1b \
-    --hash=sha256:ee7c751544e35a7b7fb5e3fb25a49dade37d51e70a93e5107f10575d7102c311 \
-    --hash=sha256:c823de61ff40d1996fe087cec343e0503881ca641b897e0f9b86c7683a0bfee1 \
-    --hash=sha256:be2ff04e94a2b5454ddcfbebb81ee8e46162734d4c2fcc90c422d16ab51f810b
-# six is required by Sphinx, bleach, cryptography, django-environ, django-extensions, easy-thumbnails, elasticsearch-dsl, html5lib, nobot, pathlib2, pyOpenSSL, sphinxcontrib-httpdomain
+pytz==2016.7 \
+    --hash=sha256:a7bfa766bc70adb72f32476c7e5d8fd911c569beb75f192271743a166be4a218 \
+    --hash=sha256:c6fe748ed6c676d9404b47897cfb399c514fb7428298465c8a3310ee5a2a0ec9 \
+    --hash=sha256:6eab31709e3a4aea748457707da45e805b650cbb352583805d2417de2a1dd71e \
+    --hash=sha256:8787de03f35f31699bcaf127e56ad14c00647965ed24d72dbaca87c6e4f843a3 \
+    --hash=sha256:054d9814d00254571cff84f6faedb25c046008322cbe51a6d5664c912b4f2929
+# six is required by Sphinx, bleach, cryptography, django-environ, django-extensions, django-tables2, elasticsearch-dsl, html5lib, mock, nobot, pathlib2, prompt-toolkit, pyOpenSSL, sphinxcontrib-httpdomain, traitlets
 six==1.10.0 \
     --hash=sha256:0ff78c403d9bccf5a425a6d31a12aa6b47f1c21ca4dc2573a7e2f32a97335eb1 \
     --hash=sha256:105f8d68616f8248e24bf0e9372ef04d3cc10104f1980f54d57b2ce73a5ad56a
-sphinx-rtd-theme==0.1.9 \
-    --hash=sha256:3c38d037713bd78043486eea5bf771d71ed697ec25c09e16f49e44887f7fe184 \
-    --hash=sha256:273846f8aacac32bf9542365a593b495b68d8035c2e382c9ccedcac387c9a0a1
+sphinx-rtd-theme==0.1.9
 sphinxcontrib-httpdomain==1.5.0 \
     --hash=sha256:eab097505caee272ca6a313edb2cbc3d2103bb6bcc09923ef43054e238452f6b \
     --hash=sha256:b71d0cb398691a1aab0c74e26cdc0e4293dba6bb495f53fea6794bc14ea001ee
+sphinx_rtd_theme==0.1.9 \
+    --hash=sha256:3c38d037713bd78043486eea5bf771d71ed697ec25c09e16f49e44887f7fe184 \
+    --hash=sha256:273846f8aacac32bf9542365a593b495b68d8035c2e382c9ccedcac387c9a0a1