datamapper -> sequel
update to ruby 2.2
add initial migration with `sequel -d`
add db migrate rake task
rename dev db to development
require url for modulator route
dump yml only for find

if we have a create afterwards, the dumped yml
is dumped once more and we end up with a
doubly dumped yml in the database.
set created_at for each url create
remove old (one-time) migration