Add action creator into Param Store

[Chun-Yang]

1. add action creator into ParamStore
2. change Link component to accept the store?
3. change reacterminator so that it use the new syntax?
4. minimize API, remove setAll and getAll?

[Chun-Yang]

Right now, we pass store to ParamStore and use ParamStore as an action emitter. It seems a more 'redux' way to do it is to use an action creator. In another term, the API we have in ParamStore is leaky.

Also, ParamStore's api is leaky for another reason: we still use 'window.history.back' instead of something like 'ParamStore.back'.