Expose State(..) in Bootstrap.Tab

[samlee64]

module Bootstrap.Tab exposing
    ( view, config, items, initialState, customInitialState, Config, State
    , pills, withAnimation, justified, fill, center, right, attrs, useHash, Option
    , item, link, pane, Item, Link, Pane
    , subscriptions
    )

State is currently an opaque type. Could we expose all of State so that I am able to grab what the active tab is?

[rundis]

Whats the use case? Typically you would use elm navigation in most web apps, then you can keep track of the id of the active tab explicitly in your own state by handling navigation events and pick out the hash from the url passed in.

[rundis]

Duplicate of #65