RF - Make peaks_from_model part of dipy.direction
added .npz file of new sphere
added new sphere repulsion724 in dipy.data.get_sphere
DOC: Warn about the GPL license of SHORE.
DOC: Replicate this in the docstring, just to be safe.
added sphere repulsion100
TST: Test for both data with and w/0 b0.
BF: fixed compatibility issues between vtk 5 and 6
BF - older C compilers do not have round in math.h, uisng dpy_math instead
BF: define our own round for c++98 compatibility
BF: round to nearest even
BF: use define and use dpy_signbit instead of signbit. Use dpy_rint instead of round.
BF: use npy_* functions directly instead of defining our own dpy_* versions
Use NPY_PI instead of DPY_PI
NF: Starting to implement the SFM.
RF: Make sklearn an optional package.
NF: First pass at fitting the thing.
Starting to work on signal prediction.
Abstract out the design matrix construction. Predict.
BF: Make it work with different in/out situations.

On to test that it does something sensible (signal-wise).