Parse group authors from CSV and add to generated PoA article.
Merge pull request #171 from gnott/tweaks

Empty Abstract tag for correction articles.
Merge branch 'master' of github.com:gnott/elife-poa-xml-generation into group-authors
Update test data.
Change get_group_authors to return a single string not a list.
Change output directory of xml_generation to read it from the settings module rather than inline.
Test to build POA XML, prior to continuing group authors.
Create the tests output directory automatically.
Start using author position value in preparation for adding group authors using their position too.
Change to parse group authors that accepts a single string.
Add group authors to the article author dict in order of their position.
Refactor build POA XML for easier testing.
Lettuce tests for checking building of POA article objects, and small fixes.
Fix build article object lettuce test after refactoring.
Parsing group authors string with automated tests.
Add exception back to set_title
Crossref generation including group authors.
Merge pull request #172 from gnott/group-authors

Group authors