`ey deploy --migrate` now defaults to `rake db:migrate`
`ey deploy --migrate` now defaults to `rake db:migrate`

Change-Id: Ifc352d50e45ccd6b24e6033f9763b017c72143cf
Reviewed-on: http://review.engineyard.com/78
Reviewed-by: Andy Delcambre <dceae9ae498de7d794de551710d5e4d9b952cadb@engineyard.com>
Tested-by: Andy Delcambre <dceae9ae498de7d794de551710d5e4d9b952cadb@engineyard.com>

radamanthus/engineyard,radamanthus/engineyard,engineyard/engineyard,engineyard/engineyard,cowboyd/engineyard