Rails Migrations support

plugins/rails3/rails3.plugin.zsh

@@ -17,3 +17,5 @@ alias rp='_rails_command plugin'
 alias rs='_rails_command server'
 alias rsd='_rails_command server --debugger'
 alias devlog='tail -f log/development.log'
+alias rdm='rake db:migrate'
+alias rdr='rake db:rollback'