Occurrence search modified to used the latest API model objects
Solr schema updated
Occ Search IT test fixed
Merge branch 'master' of https://github.com/gbif/occurrence

# By Markus Döring (2) and Oliver Meyn (1)
# Via Markus Döring
* 'master' of https://github.com/gbif/occurrence:
  Interpret modified date and include the latest gbif parser library to replace the redundant occurrence date parsing soon
  Set last interpreted date instead of dc:modified, fixes POR-1734
  changes to match rename of api method getIdentificationDate