corrected normalization issue in the peak extraction
added peak_number option
STY: PEP8, white-space, unused import.
Merge pull request #4 from stefanv/peak_extraction_isbi

STY: PEP8, white-space, unused import.
corrected default value for peak_number
resolved conflicts
Merge pull request #141 from mdesco/peak_extraction_isbi

Peak extraction isbi
NF: new model added for constrained spherical deconvolution and a corresponding test. This is still in progress
TEST updated test for test_csdeconv
cdeconv class returns a fit object
Started example for csd
Updated csd to work with any odf_sphere
TEST updated test2
NF: example with estimated response function from the data added
TEST: added module suite from numpy.testing
Removed old sh_estimate.py