Style tweak to button overlays

adding  overflow: visible; to .wpsocialite.small, and .wpsocialite.large to fix an issue I was having with the facebook overlaid box cutting off outside of the UL element.
Merge pull request #17 from flashpunk/master

Fixing an issue with overlaid box overflow
WPSocialite 2.0

Added twitter follow button.
Cleaned up codebase.
Various bugfixes and overrides added to template tags/shortcode.