Allow empty arrays as values in grammar
Adding WMI input for collecting performance metrics and other data which is accessible via WMI on a Windows host
Merge pull request #497 from philipseidel/master

WMI input
enhanced base output
forgotten config options declarations
Merge pull request #498 from piavlo/feature/base-output-changes

Feature/base output changes
Merge pull request #407 from piavlo/feature/grammar-allow-empty-array-values

Allow empty arrays as values in grammar
base output ignore old events config option
Merge pull request #499 from piavlo/feature/output-ignore-older-than

base output ignore old events config option
Merge git://github.com/logstash/logstash