ditsing/ruaft @ 950421e0eaab4815457311d0e6f33dd497d49a3d

Jing Yang 93d36abc85 Add persister to lib, and tests.		%!s(int64=5) %!d(string=hai) anos
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persister	fa74454870 Implement persister.	%!s(int64=5) %!d(string=hai) anos
mod.rs	93d36abc85 Add persister to lib, and tests.	%!s(int64=5) %!d(string=hai) anos