Removes embedded wordpress blog from revision.
Merge pull request #170 from WGBH/remove_blog

Remove blog
Adds hook to symlink to wordpress blog in shared directory.
Changes behavior of WHDH dataset model to save pbcoreSubject metdata to entity_s solr field when subjectType == 'entity'.
Same behavior has already been implemented for other dataset models. This just got left out for some reason.
Merge pull request #171 from WGBH/development

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