Reverted to using Ubuntu precise.

Author: mmasdeu

.travis.yml

@@ -1,4 +1,5 @@
 language: python
+dist: precise
 matrix:
   include:
   - env: CACHE_NAME=latest DEPLOY_DOC_FROM_BRANCH=master DEPLOY_DOC_TO_REPOSITORY=username/sample_sage
@@ -24,4 +25,4 @@ after_success:
 - "./.travis-deploy-doc.sh"
 before_script:
 - openssl aes-256-cbc -K  $encrypted_2f33c728c8dc_key -iv $encrypted_2f33c728c8dc_iv
-  -in .travis_ci_gh_pages_deploy_key.enc -out .travis_ci_gh_pages_deploy_key -d
+  -in .travis_ci_gh_pages_deploy_key.enc -out .travis_ci_gh_pages_deploy_key -d || true