Added Auto-Indexing, more CSV options, better configuration/parameter handling

* import files can be now compressed as .gz or .zip
* supports multiple csv files for nodes, relationships, comma separated
* supports automatic indexing with headers like "name:string:users"
* supports index lookups for relationships for start/end fields "name:string:users" and the litaral values
* supports now config file based setup
* supports keeping the database instead of cleaning
* supports opencsv as reader, alternative delimiters, quotes
* supports caching in index lookups using MapDB in front of lucene
* added faster default CSV reader
* added new type LABEL that will also be used for node-labels in the future