direct push to elastic search

[RobTranquillo]

A extra start option should be available. By changing an new file, named es-config.ini.
available options:

• use ES push : on|off
• host : localhost
• port : 9200
• index : ratsinfo //comparable to a sql db
• doctype : sitzungen //comparable to a sql table

Function diagram:

1. get last known index_id from ES to append
2. after scraping changes sessions/files overwrite metadata.json in ES
3. after scraping new sessions/files insert metadata.json in ES

talk to elastic search:
http/curl request:

CURLOPT_URL : http://$es_host:$es_port/$es_index/$doc_type/$index_id
CURLOPT_PORT : $es_port
CURLOPT_TIMEOUT : 200
CURLOPT_RETURNTRANSFER : 1
CURLOPT_FORBID_REUSE : 0
CURLOPT_CUSTOMREQUEST : PUT | POST //index-id known = PUT, index-id unknown = POST
CURLOPT_POSTFIELDS : string{metadata.json}

A good response:

{"_index":"ratsinfo","_type":"sessions","_id":"1595","_version":1,"created":true}