make routes for snap and unsnap
make pending specs for snaps in poet controller
build out snap spec
make snap action spec pass by building snap action in poem controller
build out unsnap action and spec
add snap and unsnap buttons
Merge branch 'master' into implement_snaps
enforce uniqueness between poet_id and poem_id
in snap model
enforce uniqueness between poet_id and poem_id
in snaps in migration
Merge pull request #5 from anirudh-eka/implement_snaps

Implement snap: have primary key, and unique combination check for poet_id and poem_id in migration and model. Create poem controller actions, #snap and #unsnap. make views with primitive snap and unsnap button. Update controller and model specs