travis-ci: add html deployment to github pages

The built html output will be pushed back to gh-pages branch which in
turn is used for http://devicetree-org.github.io/devicetree-specification/
website.

There's some rendering problems likely due to github pages setup that
need to be solved.

Signed-off-by: Rob Herring <[email protected]>

Author: robherring

.travis.yml

@@ -31,12 +31,20 @@ script:
   - make singlehtml
 
 deploy:
-  provider: releases
-  prerelease: true
-  api_key:
-    secure: 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
-  file: "build/latex/devicetree-specification.pdf"
-  skip_cleanup: true
-  on:
-    tags: true
-    branch: master
+  - provider: releases
+    prerelease: true
+    api_key:
+      secure: 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
+    file_glob: true
+    file: "build/latex/devicetree-specification.pdf"
+    skip_cleanup: true
+    on:
+      tags: true
+      branch: master
+  - provider: pages
+    github_token: $GITHUB_TOKEN
+    local_dir: "build/singlehtml"
+    skip_cleanup: true
+    on:
+      branch: master
+