updated kalibro_gatekeeper_client
All occurences of base_tool were replaced by metric_collector

This broke kalibro_gatekeeper_client MetricConfigurationSnapshot. So the gem was updated to the git version
Choose metric JS renamed to MetricCollector
Factory base_tool.rb renamed to metric_collector.rb
Updated kalibro_gatekeeper_client gem to 1.0

Signed off by: Alessandro Palmeira <alessandro.palmeira@gmail.com>
Merge pull request #117 from mezuro/refactoring_collectors

Refactoring collectors