Code blocks inside other blocks do not roundtrip

[jeromesimeon]

For instance:

bash-3.2$ cat test/data/quotecode.md 
> ```
> a
> b
> c
> ```
bash-3.2$ ../markdown-cli/index.js transform --input test/data/quotecode.md --roundtrip 
7:55:52 PM - info: 
> ```
a
b
c
```

[jeromesimeon]

Fixed in #306

bash-3.2$ more test/data/codeinblock.md 
> ```
> a
> b
> c
> ```
bash-3.2$ ../markdown-cli/index.js transform --from markdown --to ciceromark --input test/data/codeinblock.md --roundtrip 
11:36:56 AM - info: 
> ``` 
> a
> b
> c
> ```
bash-3.2$ more test/data/codeinblock2.md 
- > ```
  > a
  > b
  > c
  > ```
- > > ```
  > > a
  > > b
  > > c
  > > ```
bash-3.2$ ../markdown-cli/index.js transform --from markdown --to ciceromark --input test/data/codeinblock2.md --roundtrip 
-  > ``` 
   > a
   > b
   > c
   > ```
-  > > ``` 
   > > a
   > > b
   > > c
   > > ```
bash-3.2$