preliminary popup implementation
correct popover position on fixed el's, refactored popover
made all links popover for now
tweaked popover positioning logic
refactored popover width, popover does not overlay target
add 15px buffer to popover
popover tail implemented
tail follows scrolling
updated demo page for popover
Merge pull request #4 from musocrat/gh-pages-2.0.0

Gh pages 2.0.0