CI: build-docs requirements during install_travis

Author: jreback

ci/build_docs.sh

@@ -21,9 +21,7 @@ if [ x"$DOC_BUILD" != x"" ]; then
 
     echo "Will build docs"
 
-    source activate pandas
-    conda install -n pandas -c r r rpy2 --yes
-
+    # sudo deps
     time sudo apt-get $APT_ARGS install dvipng texlive-latex-base texlive-latex-extra
 
     mv "$TRAVIS_BUILD_DIR"/doc /tmp

ci/requirements-3.5_DOC_BUILD.sh

@@ -2,6 +2,10 @@
 
 source activate pandas
 
-echo "install DOC_BUILD"
+echo "[install DOC_BUILD]"
 
+echo "[install feather]"
 conda install -n pandas -c conda-forge feather-format
+
+echo "[install r, rpy2]"
+conda install -n pandas -c r r rpy2 --yes