ability to specify a type for derived properties#116

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flipside wants to merge 4 commits intoAmpersandJS:masterfrom

flipside:derived-type

Commits on Dec 6, 2014

added type attr for derived properties to allow for derived states
flipside
committed
refactored get for derived props to obey dataType, added init option for derived, added tests
flipside
committed

Commits on Dec 10, 2014

support and tests for derived default and all dataType functions
flipside
committed

Commits on Apr 10, 2015

update merge fix
flipside
committed