Add a note in the doc with URL to help link with MKL.

fix gh-1317
Added stacklist from gh-1335 in the doc of Theano.

The dostring of the file tensor/basic.py isn't automatically included
in the theano doc as others module as it don't display nicely. So we
do it in a better format manually.
fix link in doc.
small doc update
Merge pull request #1351 from nouiz/doc_mkl

Add a note in the doc with URL to help link with MKL.