Changed default relative_peak_threshold to 0.25
Fixed default + rewrote stuff
BF: predict for cases when the ADC is multi-D and S0 is provided as a volume.
DOC: Raw strings for proper latex rendering of equations.
Merge pull request #232 from samuelstjean/fix_peak_extraction

Fix peak extraction default value of relative_peak_threshold
Merge pull request #234 from arokem/bf_tensor_predict

BF: predict for cases when the ADC is multi-D and S0 is provided as a volume
DOC: reformat docstrings, code to standards

Reformat docstrings and expand docstrings for numpy docstring standard.

Change code spacing to PEP8 (remove blank lines, mainly)
RF: refactor imports to standard order

Put imports in standard order; use relative imports where possible.
RF: remove binary_threshold

binary threshold is a one-liner in numpy; use that line instead.
DOC: extend applymask docstring

Make applymask docstring more explicit
DOC: fixes to median_otsu docstring

Fixes suggested by Stefan VdW
Merge pull request #221 from samuelstjean/return_peaks_directions

peaks_from_model now return peaks directions
Merge pull request #237 from matthew-brett/refactor-median-otsu

WIP: cleanup docs / small refactor for median otsu
NF: added streamtube visualization mathod in fvtk
playing with colors and lighting properties
RF: started cleaning up the fvtk module. Removed unused functions and put all colors to be used for example with fvtk.colors.red rather than fvtk.red
DOC: on point glyphs
RF: renamed pretty_lines to streamtubes
DOC updated examples to use streamtubes
RF: simplified a tiny bit the slicer more work is needed