Allow failures on nightly

Author: iamed2

.travis.yml

@@ -8,6 +8,9 @@ julia:
   - nightly
 notifications:
   email: false
+matrix:
+  allow_failures:
+  - julia: nightly
 # uncomment the following lines to override the default test script
 script:
   - if [[ -a .git/shallow ]]; then git fetch --unshallow; fi