Technical debt: reducers should be pure js functions, they aren't

[maurelio1234]

Example:

1. Send/SendContext in
   https://github.com/xcomponent/SpyXComponent.js/blob/master/src/reducers/transitionProperties.ts

2. InitSession in:
   https://github.com/xcomponent/SpyXComponent.js/blob/master/src/reducers/session.ts

Some ideas on integrating async actions:

http://redux.js.org/docs/advanced/AsyncActions.html