modifies splash model to create a self-join association
splash now has methods #resplashes and #original_splash
minor fixes
changes a route name to more appropriate
changes "login" button to "sign up" button on create account route
modifies random seeds to accomodate for original_splash_id column
adds new test for original_splash_id column
create new migration to add original_splash_id column
Merge pull request #11 from cassidyclawson/vlad

implements "resplash" feature