Add a db:seed tasks

Provide a hook to write a seed data script in `db/seeds` against the databases
present.  Will not run unless the file is present and correct.
change local psql url to use the socket when available

this should help with db:create/drop in unix and other
environments where localhost doesn't have permissions to create or
destroy dbs

see #2
change generated env files to have dbs with the app name

eg: myapp-development instead of pliny-development
fix DATABASE_URL generation

URI#to_s is doing something weird when there's no host
Drop deleted_at from standard model migration

this won't work until the user sets sequel-paranoia. add db bloat
on top of it and I think we should leave out for now, could just
find a way to direct users to it in the docs instead?
Merge pull request #11 from neilmiddleton/db_seed

Add a db:seed tasks
Merge pull request #14 from interagent/pedro-drop-deleted-at

Drop deleted_at from standard model migration
Merge pull request #13 from interagent/pedro-dynamic-db-names

Change db name on generated apps
paranoid 3rd positional argument for models.
better erbing
bring in optparse.
Remove `App.root` reference
Add note on mediators
Drop serializer from default model generation

It already comes with the scaffold, doesn't seem needed at this
level.
Merge pull request #15 from interagent/paranoid-models

Paranoid argument for models
Merge pull request #24 from interagent/pedro-drop-serializer-from-model-generation

Drop serializer from default model generation
fix up specs, initializer.
add rake task to rebuild schema
Fix naming for files in degenerate situations

For example, `pliny-generate model Artist` could result in `Artist.rb`
instead of `artists.rb`.
Merge pull request #26 from interagent/pedro-schema-task

Add rake task to rebuild schema