RES actually gets back localStorage in Safari 6.1/7 on first reddit.com load in new tab

yucky as heck, prolly throws an exception on the background page, but it gets the job done.
RES actually gets back localStorage in Safari 6.1/7 on first reddit.com load in new tab

less yucky version
call "setup" callback immediately as well as on an interval
Merge pull request #618 from andytuba/safari7-loadfirsttime

Load RES in Safari 7 / 6.1 on first time reddit.com is loaded in a new tab
added a tweak to the Safari fix, helping prevent FOUC.

there's still a weird glitch where a cached reddit page doesn't get RES on first new tab -> page load, but I just don't see a way around it, and at this point it's not worth battling. no error message comes up, nothing sensible happens.. it just doesn't run.
toned down draft style just a bit.. contrast was a bit low.