Add rdrs method to reset the database(s)

plugins/rails/rails.plugin.zsh

@@ -50,6 +50,7 @@ alias rdr='rake db:rollback'
 alias rdc='rake db:create'
 alias rds='rake db:seed'
 alias rdd='rake db:drop'
+alias rdrs='rake db:reset'
 alias rdtc='rake db:test:clone'
 alias rdtp='rake db:test:prepare'
 alias rdmtc='rake db:migrate db:test:clone'