Highlight markdown blocks based on lang specified
Highlight markdown blocks based on lang specified

This changes the logic so that the markdown block is highlighted when
there is actually a language prefix in the markdown block.

This will highlight in javascript:
```js
  console.log("sup?)
```

This will not highlight at all:
```
  Not Much
```

seripap/dillinger,WhoRain/new,hhgz9527/dillinger,joemccann/dillinger,joemccann/dillinger,ojengwa/dillinger,jeremiahmarks/dillinger,un33k/dillinger,scalp42/dillinger,joemccann/dillinger,un33k/dillinger,benjamin-albert/dillinger,glaucomorais/dillinger,pat-riley/dillinger,benjamin-albert/dillinger,CJstar/dillinger,johnko/dillinger,WhoRain/new,jiusanzhou/dillinger,mtvillwock/dillinger,misterbisson/dillinger,saitodisse/dillinger,salipro4ever/dillinger,jiusanzhou/dillinger,mtvillwock/dillinger,TangHao1987/dillinger,CJstar/dillinger,hhgz9527/dillinger,baxrob/dillinger,saitodisse/dillinger,dasJ/dillinger,pat-riley/dillinger,scalp42/dillinger,seripap/dillinger,ojengwa/dillinger,baxrob/dillinger,jesusmaldonado/dillinger,TangHao1987/dillinger,misterbisson/dillinger,jeremiahmarks/dillinger,dasJ/dillinger,run-project/dillinger,run-project/dillinger,johnko/dillinger,salipro4ever/dillinger,glaucomorais/dillinger,jiusanzhou/dillinger,jesusmaldonado/dillinger