changed order of tests for theano (#4643)

shortest first. if they fail, stop testing.

.travis.yml

@@ -3,18 +3,18 @@ dist: trusty
 language: python
 matrix:
     include:
-        - python: 3.4
-          env: KERAS_BACKEND=theano
-        - python: 3.4
-          env: KERAS_BACKEND=tensorflow
         - python: 2.7
-          env: KERAS_BACKEND=theano
-        - python: 2.7
-          env: KERAS_BACKEND=tensorflow
+          env: KERAS_BACKEND=theano TEST_MODE=PEP8
         - python: 2.7
           env: KERAS_BACKEND=theano TEST_MODE=INTEGRATION_TESTS
         - python: 2.7
-          env: KERAS_BACKEND=theano TEST_MODE=PEP8
+          env: KERAS_BACKEND=tensorflow
+        - python: 3.4
+          env: KERAS_BACKEND=tensorflow
+        - python: 2.7
+          env: KERAS_BACKEND=theano
+        - python: 3.4
+          env: KERAS_BACKEND=theano
 install:
   # code below is taken from http://conda.pydata.org/docs/travis.html
   # We do this conditionally because it saves us some downloading if the