Merge pull request #1675 from nouiz/fix_test_float32

c.data + 1 return numpy.float64 when c.data is float32. But we compute i...
Test using conda to speed up the install of scipy
use python 2.7 for conda.
Force the installation without prompt.
more the old scipy installation.
try to use the python 2.6 compiler.
Try to make use of python 2.6
try to use conda python impl.
try to use conda python
another try
try to use conda for travis-ci
try to use conda for travis
try conda...
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Don't link directly with blas as we need to figure out how to find it.
try to make travis-ci start.