solved problem with trailing ./ in tar archive and json object format in _settings file of an index

If the relative path in an archive was with a trailing ./ the import failed! fixed in RestImportAction.java

Another Bugfix was the json object of _settings file of an index. It was only one object with key value, the keys contained the hierarchy with dots. the result of that is, the index was imported with the default settings. I fixed this with very ~strange..