mrg multinational grad

Fix march on windows

Travis ci scipy

don't use the equivalent flags for -march=native for llvm 

This remove a warning introduced in gh-1265.

Change an assert to a warning and disable the functionality.

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 speed up the test time of the other part.

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)