* break auth panel render into submethods
* move var definition
* break renderUnathorized into submethods
* hide login providers behind dropdown if they are exceed length of 3
* amend dropdown to behave nicely being placed in another dropdown
* add style to providers enclosed in dropdown
* add provider reducer and actions
* add provider save/restore to app flow
* place last login provider first in providers list
* infer StoreState from combineReducers return type
* move collapsed threads retoration to action
* fix: provider lost in other
* add dynamic threshold depending on window width
* fix & add tests
Vyrtsev Mikhail
