Updated the keenspot definition.  Schlock Mercenary and Sheldon are
no longer keenspot comics, if they ever were, so I broke them out
into their own definitions.  I also added the following comics to
keenspot:

Shockwave Darkside
27
Skullkickers
Supernovas
Wayward Sons
Return of the Exile

In addition, Schlock Mercenary's definition now correctly grabs the
bonus text that accompanies some strips.