Resolve "Move as much business logic into models.py"

See merge request !121

- thank you tests...

- mostly involving the abstraction of validators int seperate file

Closes #176

- unique and valid shorts are only used

Resolve "Allow Shortlinks less than 3 Characters"

See merge request !120

Closes #150

Resolve "Support Unicode Shortlinks"

See merge request !119

- also drop target in favor of destination

Closes #149

Resolve "Get back to minimum viable product to ease development"

See merge request !118

- Achieve MVP

Closes #181

- a bit incosistent in CI testing

- For some reason I don't need to specify for docker?

- Need docs on how to run tests locally

- support for the entire range as well as multiple
character emojis

- right now, urls.py only accepts emoji. I need to
go in and modify the regex to support the old way and
the new

Closes #149

- more semantic
- also ensure that dev flow is good to go re: docker

Resolve "prevent visually similar characters from appearing in the same generated url"

See merge request !117

- clean and rename the startup script

- much, more more control

added uppercase ascii letters to the variety of characters that could appear in urls, but removed visually similar characters from appearing

Resolve "Case insensitive routes (e.g. myLinks)"

See merge request !115

- stay back!

Resolve "Adopt Django 2.0"

See merge request !113

- we don't need this anymore

- style guide: 2018 edition
- thankfully nothing big breaks
- man this is a bigger project than I remember