[Feature request] Add support for THEAD & TBODY tags

[aledeg]

Today, I've tried to convert markdown to pdf. For the most part, it works well. Unfortunatly, I cannot convert tables since the markdown library adds thead and tbody when parsing the following syntax:

| x | 1 | 2 | 3 | 4  |
|---|---|---|---|----|
| 1 | 1 | 2 | 3 | 4  |
| 2 | 2 | 4 | 6 | 8  |
| 3 | 3 | 6 | 9 | 12 |

See #58

[ambroisemaupate]

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