WIP ENH: Add source-space distances
ENH: Better style
ENH: Use scipy
ENH: Add to __init__.py
ENH: Add test, cleanup
ENH: Add version checks
ENH: Works with scipy limit
ENH: Cleaner
FIX: Fix timings
FIX: Update whats_new and reference
FIX: Fix partial
STY: Cosmits
Merge pull request #802 from Eric89GXL/src-dists

ENH: Add source-space distances