field_remove option in base filter + fields are arrays only if they have more than one value
filter based on field names too + any or all match logic
some docs changes
Merge remote-tracking branch 'upstream/master' into feature/base-filter-changes
rspec tests for tags, exclude_tags, include_fields, exclude fields with AND/OR logic
fix kv tests to expect for not array values for singles
need to add include_any & exclude_any as reserved words
fix grep filter tests to expect for not array values for singles
fix grok filter test to expect for not array values with add_field
Merge pull request #432 from piavlo/feature/base-filter-changes

enhanced base filter logic