PX COUNTERS - basic "counter" - new counter record in database w/ GraphQL

[Falieson]

Instead of PostgresDB, start with sqlite (provided by react-starter-kit, and then switch it to postgres)

• [x] if there is no counter record in the database, create it
• [x] find latest counter and pass its value to the counter component rendering at the home ('/') route
• [x] clicking increment/decrement updates the counter record in the database
• [x] implement using Relay MODERN not the older relay package

[tijesunimi-peters]

@Falieson I have the updated version of this Issue strictly using the react-relay and I would like to push so you can review it

[Falieson]

@andela-tpeters I added rights for you to push, please make a new branch if you run into merge conflicts. In the future I'd suggest the typical opensource collaboration process of forking and make PRs

[tijesunimi-peters]

I have fixed the conflicts and everything seems to be working well on my end.

[Falieson]

@andela-tpeters reading over your latest commit I still see import Relay from 'react-relay/classic';