This was breaking Theano on briaree

I also changed the parsing to make it work with g++ 4.4.4 4.5.1 4.6.3

add equivalent of -march=native to g++ command line.

Sparse

This allow to remove the value itself from the graph earlier.

crash fix: theano.sparse.Dot didn't created the output var with the right number of dimensions when one input was a vector.

Test careduce add

Fix variable used (HOMEPATH is not always defined)

Install scipy in travis-ci buildbot.

Adv sub1: allow broadcasted index vector.

A test was using CAReduce{add} instead of Sum, so the accumulation
dtype could not be set.

Also fixed CAReduceDtype.make_node to allow use of CAReduceDtype{Add}
directly, instead of Sum.

Warn infer shape test