Override properties used in connect methods from configuration

[MV88]

It is known that the properties used in connect method are not overridable from the config.
This can be achieved with some workaround ( set them in componentWillMount) but this is bad practice.

[offtherailz]

We could set the initialState in componentWillMount or use something like "initialActions" to run on Plugins add to initialize the state (only once).
A convention should help...
Otherwise every plugin does it by itself. @mbarto what do you think. Should we schedule this for this release?

[mbarto]

I would avoid using lifecycle methods. My idea:

• define a connect wrapper using a custom mergeProps function
• use the connect wrapper in plugins definition
• the custom mergeProps will override connected props with props from the plugin cfg (instead of the opposite)

I am going to prepare a PR for this

[MV88]

👍