Ticket #2257: tile function with grad support

now pretty print works for scaler variables too.

Fix all the sorts so that they will work on python 3.

fix compilation with cygwin

small doc update and interface addition.

delete redundant references to a module

Update gradient.py

Fix typo in doc string.

Add autoname

Fixed one more possible comparison with None

Use key to avoid comparing Apply nodes.

add GradClip op

[FIX] Add define for PyInt_FromSize_t for Python3.

Multi-GPU scan fixes

Document steps required to get Theano up-and-running on Ubuntu LTS (optimized)

Change default platform to something that don't change when it isn't nee...

Fix infer_shape user warning for not implemented case

Fix compilation crash with cudnn on python3

Sparse slice with step

Note: the setup develop call is required IFF there is a change
to the set of command-line (or other) entry points for the package,
but it is not required for *most* changes.

abergeron requests removal of it, so I'm removing it.

Instead of putting the "if you work harder you can get better performance"
note before the code, make the code the first thing you see and only
note that you could do it another way in the performance testing section.

Also switches to code-blocks throughout.

Adds note that the openblas thread limit note seems to be outdated,
the section above notes that we should be linked to multithreaded
blas already, and testing seems to suggest we are.