Added test.py for new submodule
Nope this is going to a different branch sorry...
DOC fixed some minor docstring issues with sphinx in dsi.py
RF DiffusionSpectrumModel is now called DiffusionSpectrumSingleVoxelModel and similar for Fit
BF corrected import from multi_vox to multi_voxel
TEST added test for multivoxel
RF used decorator for multivoxex and single voxel case