- fix thread count calculation bug
 - let write_value and write_index become C macro

 - add multidim support for top_k
 - use unified TopKOp, can implement topk, argtopk, and both

Attempt to lock PR tests to the specific version of libgpuarray that they require.

Add covariance matrix function theano.tensor.cov

Specifying culprit node in `MissingInputError`

Spatial Transformer Network Ops using cuDNN

Add g++ "-WL,-rpath" argument for CTC ops.

separate copying inputs and copying orphans

Adding tensor6 and tensor7 constructors

Update conv doc.

phase out outdated conv3d

3D Grouped Convolutions

Add support for boolean indexing

Update blas.py

Give good error if theano is in sys.path.

Fixed the grammar in the warning.

New destroy handler