Adding multinode harvester
Allow _content_type parameter
Merge branch 'develop' of github.com:geonetwork/core-geonetwork into multinodeharvest

Conflicts:
	harvesters/src/main/java/org/fao/geonet/kernel/harvest/harvester/AbstractHarvester.java
Merging geonetwork 3.x harvester  into existing default geonetwork harvester
Merge pull request #674 from Delawen/multinodeharvest

Adding multinode harvester
Merge branch 'develop' of github.com:geonetwork/core-geonetwork into develop
If the file is created before this sentence (like on File.createTemp), we have to overwrite
Merge branch 'develop' of github.com:geonetwork/core-geonetwork into develop