Change page <title> according to file name

Hi!

here's a patch deriving a page title from its (file-)name. E. g., given the style file:
```html
<html>
  <head><title>$title</title></head>
<body>
</body>
</html>
```
and the file `/var/www/Ramen Recipes.md`, `$title` is replaced with `Ramen Recipes` when generating the html page.

[96dd522](https://github.com/ybastide/apache-mod-hoedown/commit/96dd522a60eca33244bc8fdd54f29728326425db) is the real patch, the three others just clean warnings from git, Automake and GCC.

Thanks for apache-mod-hoedow!

Yves