Add index_field to ArticleWrapper
Fix deleting of API Sign-On token on HEAD request
See comment inline in code for an explanation
Merge pull request #109 from nburka/add-index-to-article-wrapper

Add index_field to ArticleWrapper
SiteAudio is a subclass of SiteMedia, so make it's wrapper a subclass of SiteMediaWrapper
Merge pull request #111 from isaacgrant/audio-media-wrapper-inheritence

SiteAudio is a subclass of SiteMedia, so make it's wrapper a subclass of SiteMediaWrapper
Fix spelling of interpolate.
Merge pull request #114 from gauthierm/interpolate

Fix spelling of interpolate.
Merge pull request #110 from nburka/fix-api-sign-in-head-request

Fix deleting of API Sign-On token on HEAD request
prepare for release of 2.1.27 | package party