A blank line starting with `:` splits the "RESULTS" section

For example, 

```
#+RESULTS:
: TransferFunction{Continuous, ControlSystems.SisoRational{Int64}}
:     s + 2
: -------------
: 3s^2 + 4s + 5
:
: Continuous-time transfer function model
```

is rendered as

```
TransferFunction{Continuous, ControlSystems.SisoRational{Int64}}
    s + 2
-------------
3s^2 + 4s + 5
```
:
```
Continuous-time transfer function model
```
