added verbose gitignore file and changed server from sqlite3 to pg
created migration files for users, trees, sketches, and votes
added associations to user, sketch, and vote
created nav bar with basic login logout and signup. Also added validations and has secure password in user model
completed signup, login, and logout. Paths, forms, and sessions work
fixed minor use of local variables for user and session, created current_user helper and utalize helper in navbar
fixed associations with parent and children sketches
replaced missing parent_id string column in users table removed in last commit
Merge pull request #1 from jsum528/models

Models