Router Store: Expose some selectors for selecting router info

[brandonroberts]

We already have a reducer to add router state on navigations, but don't provide any selectors to get the data out. We should provide a minimum set of selectors out of the box to get:

• query params
• route params
• route data
• url

The initial idea is that this would be a function that returns selectors for the items mentioned above, similar to getSelectors() in Entity.

[jtcrowson]

I can take it Actually, I may not have time this week, but I'm interested if no one else picks it up.

[santoshyadavdev]

Hi @jtcrowson ,
Should I take it, I am done with my existing PRs.

[brandonroberts]

@jasonhodges is working this one already