HTML output is lacking borders, alignment

```
I've used get_html_string() - but it produces a rather poor table.
It lacks:
1. Borders
2. Alignment settings

I'd also add using a sans-serif font should be very helpful.

This will make the HTML on par with the ASCII output. Currently, it's not
usable as it looks real bad (at least on my test case).
The ASCII output looks excellent.
```

Original issue reported on code.google.com by `myk...@gmail.com` on 15 Oct 2014 at 8:39

Start by locating get_html_string() and compare its HTML table output with the ASCII renderer. Check how borders, alignment, and font styling are represented in the generated HTML; done means the HTML output includes the requested presentation improvements and remains comparable to the ASCII output.

Written by the indexing model from the issue text.