increase timeout for stencila tests on travis

.travis.yml

@@ -16,8 +16,8 @@ script:
 # cd into tests so CWD being repo2docker does not hide
 # possible issues with MANIFEST.in
 - pushd tests;
-  if [ ${REPO_TYPE} == "r" ]; then
-    travis_wait pytest --cov repo2docker -v ${REPO_TYPE} || exit 1;
+  if [ ${REPO_TYPE} == "r" ] || [ ${REPO_TYPE} == "stencila" ]; then
+    travis_wait 30 pytest --cov repo2docker -v ${REPO_TYPE} || exit 1;
   else
     travis_retry pytest --cov repo2docker -v ${REPO_TYPE} || exit 1;
   fi;