include timestamps in migration template

[jdoconnor]

No description provided.

[shaqq]

These are already included, no?

[umtrey]

They are not - the migration is blank. However, you can't include timestamps unless you know it's a new table migration (as opposed to change table migration), so I really don't think this issue is valid outside of the scope of adding full migration generation capabilities within napa.

[shaqq]

In Rails, when you do rails generate migration CreateMayhem explosions:integer, it does not add timestamps to the migrations.

However, if you do rails generate model DrEvil recipes:string, it will add the timestamps in the migration that is generated (along with the model file)

[heymackey]

This should be closed by #207

[shaqq]

indedededeed!