Merge pull request #202 from samuelstjean/typos

Typos
RF: Rename tensor statistics to remove "tensor_" from them.

They are all in the dti module after all.
Merge pull request #203 from arokem/tensor_rename

RF: Rename tensor statistics to remove "tensor_" from them.
NF: two new functions in odf.py as well as suggestions for improving the CsaOdfModel DIPY example
wip
wip
added csa_odf_example_gfa_sh.py to highlight the problem with the csa odf model sh coefficients and gfa computed from it
added csa_odf_example_fulldata, to again highlight the problem of the csa odf
RF - working on odf display examples
BF - replace `odf_remove_negative_values` with `numpy.clip`
wip
wip: revisiting the DTI example to add a better FOV, color Fa and other stuff
Changed the field of view and added other metrics computed in the DTI example on the Gallery
Changed math formula in DTI example to be more consistent with existing literature
NF: new model added for constrained spherical deconvolution and a corresponding test. This is still in progress
TEST updated test for test_csdeconv
cdeconv class returns a fit object
Started example for csd
Updated csd to work with any odf_sphere
TEST updated test2