Only run staticdocs if deploying

Author: hadley

.travis.yml

@@ -13,10 +13,6 @@ install:
 
 script: ./travis-tool.sh run_tests
 
-after_success:
-  - ./travis-tool.sh install_github hadley/staticdocs
-  - R -e "staticdocs::build_site()"
-
 on_failure:
   - ./travis-tool.sh dump_logs
 
@@ -25,6 +21,11 @@ notifications:
     on_success: change
     on_failure: change
 
+
+before_deploy:
+  - ./travis-tool.sh install_github hadley/staticdocs
+  - R -e "staticdocs::build_site()"
+
 deploy:
   edge: true