webapi-vim is a Vim interface to Web APIs. It is required by Gist.vim (already part of YADR) to be able to post gists to Github via OAuth2. See https://github.com/mattn/webapi-vim for details. Gist.vim requirements note: http://git.io/pwMo9A#requirements
We are purposefully including an older version of snipMate (0.84) from mikefarmer's repo so that it works with the long list of snippets available from the scrooloose/snippets collection. The current mainline snipMate seems to be no longer compatible with those snippets, but the scrooloose collection is still the best one to use.