Merge pull request #14 from syncsynchalt/master

Accept this so I can get back to mocking andrzej
stop on more prominent headings
ignore Talk pages
more carefully find wikipedia sub-sections
https soundcloud URLs
fix ImgurGallery, fixes gh-15
add imgur icon
fix anchor links in wikipedia excerpts
shorter
fix post hook error test
fix TED embed
be sure to call to_app
use Vine postcard embeds
Source -> Provider
remove some unused deps
more cleanup
fix beer advocate title
add Twitter Card provider factory, what
add Ars Technica as Twitter card site
no more factory crap