Hook into wp_head() and wp_footer()

[WraithKenny]

Makes placement of tha_footer_bottom and tha_head_bottom optional,
falling back to @obenland idea of hooking into the corresponding wp
standard hooks. Priority of tha_body_bottom moved higher then default
wp_footer. Also, a few whitespace cleanups.

[WraithKenny]

bah, I had hoped this would attach to #4

[WraithKenny]

Actually, I could just edit it via Github Web UI, probably be cleaner., if you want. I'll separate out the whitespace edits.