Add Postgresql as database. Set up user table.
Create User model.
Add shortened url table
Add short_url class
Add ShortenedUrl random code and factory method. Set up ShortenedUrl to User associations.
Add visits table
Create visit class. Add associations for visit to shortened url and user. Add association through visit for shoretened url
Add visit counting methods to the ShortenedUrl class.
Add CLI interface
Add create_taggings table and class. Add create_tag_topics table and class
Add TagTopic and Tagging classes. Set up relationships between Shortened Urls and Tag Topics through Taggings.
Add tag choosing in create url cli
Remove uneccessary Rails files. Add database seed data.
Merge week 3, day 3 work (URL Shortener).

Conflicts:
	.gitignore
Move URL Shortener to right directory and add README.