Adding serialization doc.
Adding serialization doc.

Reviewers: swsnider

Reviewed By: swsnider

CC: jwall

Maniphest Tasks: T39

Differential Revision: http://d.sil.as/D100

bsimser/rise-to-power,bsimser/rise-to-power,bsimser/rise-to-power,bsimser/rise-to-power,bsimser/rise-to-power