Fixed imgur images

Didn't need all the array handling after all, imgur will give you the right image no matter what extension you use in the url.  Really helpful, right?
Remove sticky posts

*Maybe* I'll want to make this something you can toggle, but I'm pretty sure I wont.
Remove 500px and flickr links

For now, licensing makes adding them pretty involved.
Slightly refined processImages

Seems to be working correctly now.
Infinite Scroll working

Once user gets one screen height from the bottom of the posts div, another reddit page of posts are added.  It's pretty laggy right now, but it works!