Merge pull request NASAWorldWind#143 from NASAWorldWind/feature/continuous-docs

Publish API documentation to gh-pages on every push to develop

Author: zglueck

.travis.yml

@@ -26,6 +26,13 @@ script:
 
 # Deploy build artifacts. Travis does not invoke this step for pull request builds
 deploy:
+  # Publish API documentation to GitHub Pages
+  - provider: pages
+    github_token: $GITHUB_API_KEY
+    local_dir: build/doc/javadoc
+    skip_cleanup: true
+    on:
+      branch: develop
   # Create CHANGELOG.md in the current directory
   - provider: script
     script: ./travis/changelog.sh >> CHANGELOG.md