peak_extraction can now return peaks directions
peaks_from_model now uses ndindex instead of enumerate
shape as a tuple broke some tests and the function, now fixed
Added ndindex changes that got mixed up somewhere else
Travis got stuck, making it rebuild.
Removed stuff
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