Serve information about handles as json over xmlui.
Adds version header to org.dspace.app.xmlui.aspect.handle.HandleResolverReader
Simplified API of handleresolver.
DS-1637 JSPUI implementation and small improvements (config / error code)
Draft: Multi remote DSpace Repositories plugin for handle storage
Enhanced the MultiRemoteDSpaceRepositoryHandlePlugin.

Removed dependency from dspace.core.ConfigurationManager.
Implemented property file containing the URLs of DSpace handleresolver.
Load the handle prefix from handle resolver instead of duplicating
configuration.
Merge branch 'DS-1637-2' of https://github.com/tuub/DSpace into DS-1637-2

Conflicts:
	dspace/config/dspace.cfg