Sti master

- Simplified routes: All users home pages now have routes like users/1, users/2, i.e. no more athletes/1, coaches/2.

- I made it so that a logged in user gets redirected to their home page if they try to access somebody elses, i.e. if user #1 types in the url users/2, they get redirected to users/1.

- I added database.yml to the .gitignore file but for some reason it still committed my changes.. every time we pull we don't want to have to be updating db credentials.