remove -Werror warning as this make the compilation fail with numpy 1.7b1

theano/tensor/nnet/Conv3D.py

@@ -161,7 +161,6 @@ class Conv3D(theano.Op):
 
     def c_compile_args(self):
         flags =  ldflags(libs=False, flags=True)
-        flags.append('-Werror')
         return flags
 
     def c_lib_dirs(self):

theano/tensor/nnet/ConvGrad3D.py

@@ -85,10 +85,6 @@ class ConvGrad3D(theano.Op):
 
         output_storage[0][0] = dCdW
 
-    def c_compile_args(self):
-        flags = ['-Werror']
-        return flags
-
     def c_code(self, node, nodename, inputs, outputs, sub):
         V, d, WShape, dCdH = inputs
         fail = sub['fail']

theano/tensor/nnet/ConvTransp3D.py

@@ -35,10 +35,6 @@ class ConvTransp3D(theano.Op):
 
         return theano.Apply(self, inputs=[W_,b_,d_,H_, RShape_], outputs = [ T.TensorType(H_.dtype, (False,False,False,False,False))() ] )
 
-    def c_compile_args(self):
-        flags = ['-Werror']
-        return flags
-
     def infer_shape(self, node, input_shapes):
         W, b, d, H, RShape = node.inputs
         W_shape, b_shape, d_shape, H_shape, RShape_shape = input_shapes