Some changes to the default HTML output.

Some minor changes to the HTML output of Krumo, making it more legible and a little bit more consistent (or recognisable) for those who are familiar with var_dump()'s output. Tested with the current themes, as well as my own "stylish" theme. 

Screenshot with "modern" theme: 

![screen shot 2013-10-29 at 15 23 19](https://f.cloud.github.com/assets/1833361/1428687/88ed8bc8-40a6-11e3-809f-e01d4c94d157.png)

Screenshot with "stylish"  theme: 

![screen shot 2013-10-29 at 15 21 03](https://f.cloud.github.com/assets/1833361/1428680/79d91346-40a6-11e3-85a6-1826aff3e41e.png)