Modifications done following Ariel's comments
added and complemented documentation
DOC: Working on RESTORE example. Enhanced DTI docstring.
WIP
BF: Consider the absolute value of the residuals.
DOC: RESTORE example with data.
NF: added a new analytical response function derivation for Models that compute ODF with the r2 term
faster test
resolved conflicts and rebased with nipy-dipy-master
resolved conflicts
resolved conflicts
rebasing
rebasing
faster test
Modifications done following Ariel's comments
added and complemented documentation
NF: added a new analytical response function derivation for Models that compute ODF with the r2 term
remaining traces from rebasing
Merge pull request #261 from mdesco/r2_term_response

R2 term response function for Sharpening Deconvolution Transform (SDT)
BF: This test was bogus.