- remove debug prints
 - use clear macro for 2^31-1 instead of hex

 - fixed gpu indexing error in small kernel
 - make RadixType at least 32 bits

 - also fix axis check error in gpu code

because __props__ should be read only

 - make tests faster
 - remove debug prints

 - GpuTopKOp: uncomment c_code_cache_version
 - add idx_dtype to TopKOp docs

 - add float16 suppport
 - fix 64 bit input bug
 - fix int8 bug due to integer overflow
 - more checking on k
 - add license from pytorch

 - 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.