Some prefixes does not reflect provider prefix
		e.g. camlistore.org/pkg/googlestorage is actually at
		github.com/camlistore/camlistore repository under
		pkg/googlestorage directory.

def detectCustomImportPaths(self, prefix):
		"""
		Some prefixes does not reflect provider prefix
		e.g. camlistore.org/pkg/googlestorage is actually at
		github.com/camlistore/camlistore repository under
		pkg/googlestorage directory.
		"""
		for assignment in self.ip2pp_mapping:
			if prefix.startswith(assignment["ipprefix"]):
				return {"prefix": assignment["ipprefix"], "provider_prefix": assignment["provider_prefix"]}

		return {}