Delete leftovers from moved modules.

theano/sandbox/downsample.py

-import sys
-print >> sys.stderr, "DEPRECATION: theano.sandbox.downsample is deprecated. Use theano.tensor.signal.downsample instead."
-
-from theano.tensor.signal.downsample import *
-

theano/sandbox/linalg/__init__.py

-
-from kron import kron
 from ops import (cholesky, matrix_inverse, solve,
         diag, extract_diag, alloc_diag,
         det, psd, eig, eigh, eigvalsh,

theano/sandbox/linalg/kron.py

-from theano.tensor.slinalg import kron
-import warnings
-
-warnings.warn(
-        "theano modules are deprecated and will be removed in release 0.7",
-        stacklevel=3)
\ No newline at end of file