Users can upload a profile picture. A silhouette placeholder was created and added to the assets/images directory. The placeholder will display on the user show page if they did not upload their own.
Merge pull request #25 from eisenachalex/images

added profile pictures
refactored layout view and moved sign up link so it only displays when you're logged out
Merge pull request #26 from eisenachalex/navbar

refactored layout view
Renamed the QuestionTag model to be singular, updated schema so that Tags no longer had a question_id
Added tag input to creating new posts and displaying multiple new tag objects
db stuff
fixed merge conflicts
fixed mulitple tag problem so a new tag object isn't created if it already exists