Switch router store to redux

[aenario]

For review, please have a look at these somewhat more readable PRs : https://github.com/aenario/cozy-emails/pull/1 https://github.com/aenario/cozy-emails/pull/2 https://github.com/aenario/cozy-emails/pull/3 https://github.com/aenario/cozy-emails/pull/4 https://github.com/aenario/cozy-emails/pull/5 https://github.com/aenario/cozy-emails/pull/6

Not included here, will make a separate PR afterward https://github.com/aenario/cozy-emails/pull/7

What was done

This huge PR complete the transition to Redux with the following parts :

• Make the state fully immutable, and start to use Immutable.Record model for schema enforcement and to attach function to prototype (initially to remove these functions that dont use the state from getters)
• Transform router_store, the core of the application into several reducers :
  • reducers/route handle the current url
  • reducers/modal handle the modal
  • reducers/message_fetch handle the state of fetching messages to fill the current view.
• Following what was done in previous PR, transform all getters into pure getters, ie. function(state, args ...). These pure getters are placed in the puregetters until the transition is complete. Then renamed in https://github.com/aenario/cozy-emails/pull/7
• Also transform ActionCreators in pure function(dispatch), this change is incomplete and need to be discussed cf difference between MessageActionCreator and RouterActionCreator
• Following these two changes, we can use react-redux/connect to pass all data and actions as props from the container component. For now only components/application is a container component, we need to progressively switch all panel (message-list, conversation) to container as well.
• The Router has been simplified and divided between the application specific code client/app/routes.coffee which contains routes and reverse routing and can be used from reducers & getters without introducing backbone router dependency and client/app/router.coffee which is the Backbone.Router with
• Some linting were applied in specs.js files and all around
• Some utility function were moved from getters to components utils, they will then be moved to libs in https://github.com/aenario/cozy-emails/pull/7

  "Golden rules" of the new structure

• A reducer is a function(state,action) -> newState (redux)
  • newState should always be !== state (immutable)
• A getter is a function(wholeAppState) -> transformed part of the state
• A getter should do one thing and only thing, ie split getMailboxById from getCurrentMailbox

  What to do

• create conversation_panel / list_panel / menu components to be container
• Agree on proper ActionCreator structure and progressively unify toward it.
• Use reselect or alternative to memoize getters and increase performance WHEN NECESSARY

[misstick]

@aenario can you add a description and flags to this PR to understand scope and status of this PR please?

[misstick]

@aenario : When will you finish this? This PR was opened 24 days ago, it's a long time still :)