Add KRUMO_CAPTURE so you can (optionally) have krumo::dump() return a string

Normally krumo::dump() prints out the buffer automatically. Sometimes
it's nice to have the krumo output in a string, perhaps to insert it
inside of another HTML element like a debug <div>.

Calling krumo($array, KRUMO_CAPTURE) will tell krumo to return the
generated HTML instead of printing it out. This only works if you ONLY
pass one item. KRUMO_CAPTURE does not support the krumo($one,$two,$three)
syntax. If you need this functionality call krumo with KRUMO_CAPTURE
inside of a foreach.
Add a simple test suite
The capture feature should bump the version to 0.4.1