ENH: Add automatic doc build

Add automatic docbuild and push to gh-pages

.travis.yml

@@ -22,7 +22,7 @@ matrix:
       - PYTHON=3.6 PANDAS=0.21.1
   - dist: trusty
     env:
-      - PYTHON=3.6 PANDAS=0.22
+      - PYTHON=3.6 PANDAS=0.22 DOCBUILD=true
   # In allow failures
   - dist: trusty
     env:
@@ -60,6 +60,10 @@ install:
     else
       conda install pandas=$PANDAS;
     fi
+  - if [[ $DOCBUILD ]]; then
+      conda install sphinx ipython matplotlib;
+      pip install sphinx_rtd_theme doctr;
+    fi
   - pip install beautifulsoup4
   - pip install coveralls --quiet
   - conda list
@@ -72,4 +76,16 @@ script:
     - flake8 pandas_datareader
 
 after_success:
+  - |
+    if [[ ${DOCBUILD} ]]; then
+      cd docs
+      make html && make html
+      cd ..
+      doctr deploy devel --build-tags
+      if [[ -z ${TRAVIS_TAG} ]]; then
+        echo "Not a tagged build."
+      else
+        doctr deploy doc --build-tags
+      fi
+    fi
   - coveralls

docs/source/whatsnew/v0.6.0.txt

@@ -71,4 +71,5 @@ Other Changes
 ~~~~~~~~~~~~~
 - The minimum tested pandas version was increased to 0.19.2 (:issue:`441`).
 - Added versioneer to simplifying release (:issue:`442`).
+- Added doctr to automatically build docs for gh-pages (:issue:`459`).