Installing a pinned release of Sphinx. (#1175)

This will help us avoid issues with docs search across SDKs in the future.

Author: rdegges

ci/install.sh

@@ -13,7 +13,7 @@ if [ -n "$BUILD_DOCS" ]; then
   fi
 
   info "Installing Sphinx..."
-  pip -q install --user sphinx &> $WORKDIR/target/pip.log
+  pip -q install --user -r ./ci/requirements.txt &> $WORKDIR/target/pip.log
   EXIT_CODE=$?
   if [ "$EXIT_CODE" -ne 0 ]; then
     error "Error installing Sphinx"

ci/requirements.txt

@@ -0,0 +1,22 @@
+alabaster==0.7.7
+argh==0.26.1
+Babel==2.2.0
+backports-abc==0.4
+backports.ssl-match-hostname==3.5.0.1
+certifi==2016.2.28
+docutils==0.12
+Jinja2==2.8
+livereload==2.4.1
+MarkupSafe==0.23
+pathtools==0.1.2
+port-for==0.3.1
+Pygments==2.1.3
+pytz==2016.1
+PyYAML==3.11
+singledispatch==3.4.0.3
+six==1.10.0
+snowballstemmer==1.2.1
+Sphinx==1.3.6
+sphinx-autobuild==0.6.0
+tornado==4.3
+watchdog==0.8.3