OPT: Modified dipy.core.sphere_stats.random_uniform_on_sphere, see issue 181.
RF - fix disperse_charges so that a large constant does not cause the potential to blow up.
BF: Changed from numpy.hstack to numpy.vstack as suggested by MrBago.
DOC: Added a 'Notes' and a 'References' section to dipy.core.sphere_stats.random_uniform_on_sphere, as per Numpy/Scipy documentation style guidelines.
Merge pull request #183 from ecaruyer/fix-for-issue-181

OPT: Modified dipy.core.sphere_stats.random_uniform_on_sphere, cf issue #181
Merge pull request #182 from MrBago/disp-charges-constant

RF - fix disperse_charges so that a large constant does not cause the po...
Merge branch 'master' into reconst_dti_revisited
Changed the field of view and added other metrics computed in the DTI example on the Gallery