Fix gpu integers in scan.

validate numpy1.12 compatibility changes

casting to int could lead to issues in the following case:
- 64-bit Windows
- python 2
- shape bigger than 2**31

In that case, int would be 32-bit, but shapes could be bigger and stored
in long.

Fix CAReduce.c_code_cache_version_apply
Calling `append` on a tuple raised AttributeError, which was mistaken
for a missing `c_code...` function altogether, and the version was
ignored.

Speed up one scan opt

Mixed

Typo in sharedvalue.py

* Added missing softsign import

* Update __init__.py

clarify error message.

set jenkins PR c_cache TTL to 7 days

Added broadcast check in scan.

Upgraded OpFromGraph with inline support and gradient override

Force scan n_steps on the CPU.

(small fix) Ensure Theano finds libgpuarray folders automatically in Windows with conda package