update CSS selector for last-position link/div. Fixes #121.
rewrite last location saving logic using Waypoints jQuery plugin to reduce the amount of page parsing we're doing
Merge pull request #140 from isaacdontjelindell/bugfix-121

Fix "remember last position"
fix #138#
Merge branch 'bugfix-138' of github.com:isaacdontjelindell/runestone into bugfix-138