global: lxml requirement changed

* Changes version of lxml from 3.1.2 to >=3.3.

Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
utils: several fixes

* fix_journal_name function returns the journal name as it was
  if no knowledge base is defined.

* Adds function fix title capitalization.

Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
jats_package: keyword harvesting fix

Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
world_scientific_package: new package added

Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>