Add tests for local_subtensor_inc_subtensor

Add c code for conj except for complex

Small mixed stuff

Fix Windows issue related to PR #5207

Fix master build on readthedocs

Useless sum in grad removed and test added

Added @regirster_canonizalize to local_reduce_broadcastable as the new fixes do not break the tests anymore

Add miniconda.sh to TRAVIS cache

( see comment https://github.com/Theano/Theano/pull/5207#issuecomment-260430352 ).

In Windows there are some issues with
os.listdir(path) when path is surrounded
with quotes. So it's better to remove
quotes (if present) at the start and the end
of paths passed to this function.

Checking of ldflags parts is also modified
to better handle quotes around "-L" args.

The idea is to bypass the dependency on scipy that is in setup.py, by
- providing it explicitly in the requirement file, and
- explicitly installing theano, telling setup.py to ignore "install_requirements"

This is needed because the version of scipy on readthedocs is older than
the required one, but it is not an issue for building the doc itself.

Solve

Add dilated convolution explanation to convolution arithmetic tutorial

(empty line added)

added a blank sandbox/solve.py that just imports solve from slinalg and warns the user that sandbox.solve will soon be deprecated

added documentation for solve. I had to add it to doc/.../slinalg.txt as well otherwise the method signature looked ugly in sphinx

fixing subtensor.take

Trying to add miniconda.sh to
TRAVIS cache then avoir redownloading
of this resource for every build.

Need to be tested.

Small deprecation fix