Make the python 2.6 tests use floatX=float32

.travis.yml

@@ -41,7 +41,7 @@ matrix:
     - python: "3.3"
       env: PART="." THEANO_FLAGS="mode=FAST_COMPILE"
     - python: "2.6"
-      env: PART="." THEANO_FLAGS="mode=FAST_COMPILE"
+      env: PART="." THEANO_FLAGS="mode=FAST_COMPILE,floatX=float32"
 
 script:
   - export THEANO_FLAGS=$THEANO_FLAGS,warn.ignore_bug_before=all,on_opt_error=raise,on_shape_error=raise,gcc.cxxflags=-pipe