jatsgenerator 0.3.0

Breaking change: utils.tag_wrap() was removed; replace it by using elifetools.xmlio.reparsed_tag(tag_name, tag_string).

Other than that, it should be generally backwards compatible.

Added: build. set_article_id()
Added: build. set_related_object()
Added: build. set_body()

Added other functions which support the above.

Added functions to the utils module too.

Code merged in PR #41