Adding edit/delete buttons to the find screen

they only appear when a puzzle created by the
current user is selected

Conflicts:
	src/pg13/presentation/FindScreen.java
adding delete puzzle action
Making edit button work

Conflicts:
	src/pg13/presentation/FindScreen.java
Persistence layer fixes for updating puzzles
Merge pull request #29 from williamhc/edit-and-delete-frontend

Edit and delete frontend