Update rails4.plugin.zsh

added alias for rake db:create

plugins/rails4/rails4.plugin.zsh

@@ -22,6 +22,7 @@ alias rs='_rails_command server'
 alias rsd='_rails_command server --debugger'
 alias devlog='tail -f log/development.log'
 alias rdm='rake db:migrate'
+alias rdc='rake db:create'
 alias rdr='rake db:rollback'
 alias rds='rake db:seed'
 alias rlc='rake log:clear'