Update API docs for v5 (#480)
Update API docs for v5 (#480)

* updates docs for changes in v5 (WORK IN PROGRESS)

* update docs for changes in v5

* removes unused code from example

* adds a tags to api.md for direct linking

gaearon/react-redux,jimbolla/react-redux,rackt/react-redux,gnoff/react-redux,reactjs/react-redux