README: Change hostname in examples from kakaroto to alephobjects
Adding a OHAIKIT_MISC_GROUP_PHOTO option in settings.py for the misc group image.
Using the static misc_group.png made things difficult to configure if you
install ohai_kit with pip as you'd need to modify the installation of ohai_kit
since the static finders will look in that directory and wouldn't find it
if you only add it to your deployment's static directory.
Adding a OHAIKIT_MISC_GROUP_PHOTO allows us to define it directly in the project's
settings which would make it easier to configure.
Fixes issue #19