Use nose-timelimit with travis to help find slow tests.

.travis.yml

@@ -17,6 +17,7 @@ install:
 # So we test with 0.8. Our internal buildbot have 0.7.2.
 # We install it later only for the PART that need it.
 #  - "pip install -q scipy==0.8 --use-mirrors"
+  - "pip install nose-timelimit --use-mirrors"
   - "pip install . --no-deps --use-mirrors"
 # command to run tests
 env:
@@ -36,7 +37,7 @@ script:
   - df -h
   - ulimit -a
   - echo $PART
-  - theano-nose -v $PART
+  - theano-nose --with-timelimit -v $PART
 
 
 #after_script: