BF - csd model is fitting coefficients instead of data
TST - added test for regularization sphere with CSD model
RF - Have lambda in csdmodel scale with sqrt sphere size
TST - test default lambda value
TST - added a test for the quality of csd fit with high sh order
DOC - updated docs and variable names to reflect new csd fitting method.
TST - make crossing in high order deconv test more reliably detectable.
TST - update csd-xval test
DOC: The cross-validation example changed with improvements to csdeconv.
Merge pull request #8 from arokem/MrBago-bf_csd_fits

DOC: The cross-validation example changed with improvements to csdeconv.
Merge pull request #340 from MrBago/bf_csd_fits

CSD fit issue