[wip] inline posts

~~doesn't handle cross-thread posts~~

my jquery is rusty, so i mixed in some native dom apis

styling isn't my strong suit, so that's kinda lame

idk how to integrate w/ the rest of the project, so i load the module with an anonymous function, and add a stylesheet to the document head w/ js. ~~i manually added a script tag to my testing page~~ i'm developing this as a userscript

~~there is no caching of requested threads. the ajax stuff should be its own module~~