Merge pull request #12 from gediminasgu/master

Adds mutate:remove filter to remove fields.
Added NuGet
Merge pull request #13 from gediminasgu/iislog_timestamp_col

(feat): @timestamp column for IISW3C input now is parsed from date and t...
Elasticsearch index name custom formating
Merge remote-tracking branch 'parent/master' into iislog_timestamp_col