Move travis uploading back into .travis.yml

Author: mdboom

.travis.yml

@@ -36,4 +36,6 @@ script:
 
 after_failure:
   - cd ../matplotlib
-  - ./travis_upload.sh
+  - tar cjf result_images.tar.bz2 result_images
+  - travis-artifacts upload --path result_images.tar.bz2
+  - echo https://s3.amazonaws.com/matplotlib-test-results/artifacts/${TRAVIS_BUILD_NUMBER}/${TRAVIS_JOB_NUMBER}/result_images.tar.bz2