ENH: make theano/misc/check_blas.py executable

It is intended to be ran by users so there is no reason to not have it executable
DOC: fixes typo in NEWS.txt (to be inline with LICENSE.txt "setup")
Use RST's include from doc/NEWS.txt to NEWS.txt

Instead of non-portable symlink from NEWS.txt to doc/NEWS.txt
Update release instructions to remove ref to doc/NEWS.txt
Merge pull request #1402 from nouiz/rebase2

Rebase2