Dynamic class fixes for excerpt & full post classes

fixed unpredictable class behavior  shown in  issue#29

removed has-* excerpt calsses  seemingly useless to have on single post
views

and rempoved paged classes... the body tag class can suffice for
pagenation classes
Moving legacy theme suport calls off of thematic_child_init hook

The hook was too late for the legacy post class filter to have an
effect so to  be safe I'm moving all of them