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wip - render
Fixed parse and stringify error with escape prefix - 0.2.2

1. Nest.prototype.parse can not parse more than one escaped prefix
2. Nest.prototype.stringify can not stringify and escape more than one
prefix
3. Nest.prototype.validate can not validate escaped prefix in title
4. no need escape for unicode string
Update sort out unnecessary exposed api - 0.2.5

1. Nest.parse.js => classify and decomposed
2. Nest.stringify.js => stringifyItem (render item object with
Nest.prototype.stringify directly)