Moved the documentation tests in a subdirectory. (keras-team#12228)

Author: gabrieldemarmiesse

.travis.yml

@@ -80,9 +80,9 @@ script:
   - if [[ "$TEST_MODE" == "INTEGRATION_TESTS" ]]; then
       PYTHONPATH=$PWD:$PYTHONPATH py.test tests/integration_tests;
     elif [[ "$TEST_MODE" == "PEP8_DOC" ]]; then
-      PYTHONPATH=$PWD:$PYTHONPATH py.test --pep8 -m pep8 -n0 && py.test tests/test_documentation.py tests/test_doc_auto_generation.py;
+      PYTHONPATH=$PWD:$PYTHONPATH py.test --pep8 -m pep8 -n0 && py.test tests/docs;
     elif [[ "$RUN_ONLY_BACKEND_TESTS" == "1" ]]; then
       PYTHONPATH=$PWD:$PYTHONPATH py.test  tests/keras/backend/;
     else
-      PYTHONPATH=$PWD:$PYTHONPATH py.test tests/ --ignore=tests/integration_tests --ignore=tests/test_documentation.py --ignore=tests/test_doc_auto_generation.py --ignore=tests/keras/legacy/layers_test.py --cov-config .coveragerc --cov=keras tests/;
+      PYTHONPATH=$PWD:$PYTHONPATH py.test tests/ --ignore=tests/integration_tests --ignore=tests/docs --ignore=tests/keras/legacy/layers_test.py --cov-config .coveragerc --cov=keras tests/;
     fi