Add test_lstm in travis

Author: nouiz

Diff for: .travis.yml

@@ -21,7 +21,7 @@ install:
 
 env:
   - PART="test.py:test_logistic_sgd test.py:test_logistic_cg test.py:test_mlp test.py:test_convolutional_mlp test.py:test_dA"
-  - PART="test.py:test_SdA"
+  - PART="test.py:test_SdA test.py:test_lstm"
   - PART="test.py:test_dbn"
   - PART="test.py:test_rbm test.py:test_rnnrbm"
   - PART="-e test.py"