perhaps foolishly, trying a native travis CI

.travis.yml

@@ -1,27 +1,10 @@
-# Sample .travis.yml for R projects from https://github.com/craigcitro/r-travis
+# native travis
 
-language: c
+language: r
 
 sudo: required
 
-before_install:
-  - curl -OL http://raw.github.com/craigcitro/r-travis/master/scripts/travis-tool.sh
-  - chmod 755 ./travis-tool.sh
-  - ./travis-tool.sh bootstrap
+r_build_args: --no-manual
 
-install:
-  - ./travis-tool.sh install_deps
+warnings_are_errors: true
 
-script: ./travis-tool.sh run_tests
-
-after_failure:
-  - ./travis-tool.sh dump_logs
-
-env:
-  - R_BUILD_ARGS="--no-manual" 
-  - WARNINGS_ARE_ERRORS=1
-
-notifications:
-  email:
-    on_success: change
-    on_failure: change