[#8] Fix bug that prevented setting a default resource name
[#8] Fix typo in WMS format detection
Pin down OWSLib version to ensure it includes geopython/OWSLib@e0a0da02
[#8] Minor fix in single doc harvester
[#8] Add extra xpath for getting resources

According to the ISO spec gmd:MD_DigitalTransferOptions can be accessed
via a gmd:MD_Distributer tag
[#8] Abort import stage if get_package_dict returns nothing
Merge branch 'release-v2.0' into 15-solr-based-spatial-search