Merge pull request #1246 from lamblin/fix_check_incsubtensor

Fix check that was too restrictive
Merge pull request #1226 from lamblin/stable_reduce

More stable reduce operations by default
Fixes for typos and lines too long
Typo fixes
Typo fix
PEP8 fixes
Merge pull request #1248 from delallea/minor

Minor stuff
Add dtype arg to zeros_like method of tensor vars

Conflicts:
	theano/tensor/elemwise.py