First attempt at education paragraph
Add zebrafish spinal cord example
Add trace code
Add input image to trace code
Rename figure to something useful
Fix figure markup
Small modifications following team's comments
Clarify (hopefully) wound recovery paragraph
Change 2 to two.
Update my author info
Add references for regen med
Merge pull request #20 from jni/lesion

Add another research example
Some modifications to descriptions of sub-modules
Change 'is being' to 'is'
Change 'stem cell' to 'progenitor cell'
Add acknowledgements section
Removed reference to grain boundaries

Three reasons:
1) Request from BT Im.
2) Terminology may be confusing to non-physicists
3) Not included in visualization
Merge pull request #11 from emmanuelle/education

First attempt at education paragraph
add missing API
typo + call filter.rank.median instead of deprec.