fix lolsrv plugin to allow uploading of gifs & jpgs

A simple tiny change to allow lolsrv plugin to also upload gif images that can
be created via animated lolcommits.  Also cleaned up some wierd indenting in
this plugin class.
Merge pull request #180 from mroth/lolsrv-fix-upload-animated-lols

Allow lolsrv plugin to upload gifs & jpgs