added travis doc deployment solution

.travis.yml

@@ -7,4 +7,11 @@ install:
 script:
   - npm test
 after_failure: 
-  - "cat /home/travis/builds/dolanmiu/docx/npm-debug.log"
+  - "cat /home/travis/builds/dolanmiu/docx/npm-debug.log"
+after_success:
+  - git checkout gh-pages
+  - git merge master
+  - npm run typedoc
+  - git add .
+  - git commit -a -m 'updated documentation'
+  - git push