WIP: Refactor Computed to Getter

Get rid of idea of having Stores with reference to the state their own
state
Remove jest in favor of karma + jasmine
Switch test runner to Karma + Jasmine for 0.5.0-rc1

Tests are green for 0.5.0-rc1

This major change moves some of the design closer to traditional flux
while eliminating the binding of reactor level computeds in favor of at
runtime evaluated Getters.  The syncing mechanism should now be done at
the changeObserver / UI data binding layer.